potassium thiocyanate and ferric chloride

Bailey.----- Kenneth C. Bailey and J. D. Kidd (ISBN: ) from Amazon's Book Store. We are proud to be your source for specialty chemicals. Subscribe to Envato Elements for unlimited Stock Video downloads for a single monthly fee. It was suggested by Durand and Bailey (toc. Send me tips, trends, freebies, updates & offers. Adventure of a Boy in the Forest. - 00 72 ChEBI. For terms and use, please refer to our Terms and Conditions Dilute aqueous KSCN is occasionally used for moderately realistic blood effects in film and theater. See Answer. When chloride is mixed with a solution of undissociated mercuric thiocyanate, the chloride preferentially combines with the mercury to form mercuric chloride. Ag+ (aq) + Cl– (aq) → AgCl (s) The indicator Fe3+ (ferric ion) is then added and the solution is titrated with the potassium thiocyanate solution. chloride present in the sample so that all the chloride ions present will react. FeCl 3 + 6KSCN → K 3 [Fe (SCN) 6] + 3KCl. Section B: Biological, Geological, and Chemical Science Abstract. It contains a thiocyanate. Because both solutions are colorless, they can be placed separately on each hand. We are excited to introduce our new web store coming soon. Chloride - Ferric Thiocyanate Method Interference Information Color and suspended matter may interfere with the photometric measurement. Create professional websites faster than ever. Potassium thiocyanate is the chemical compound with the molecular formula KSCN. The use of ferric chloride … 2 Names and Identifiers Expand this section. Method: During this reaction we will react a 20 ml solution of Potassium Thiocyanate with 10 drops of Ferric Chloride in a beaker, and then using the cubette and the spectrometer take a reading of the color. Fathers Day, In Slow Motion, a Mother and Son Walk Through the Park in Sweaters, A Boy Runs in a Park on a Wooden Path in Slow Motion. Research. The titrate remains pale yellow as the excess (unreacted) silver ions react with the thiocyanate ions to A more sensitive test for phenols consists of dissolving or suspending 15 mg of the unknown in 0.5 mL of methylene chloride and adding 3-5 drops of a 1% solution ferric chloride in methylene chloride. I. Freezing-points of solutions containing 054 per cent. ; Bailey, Kenneth C.; Bailey, Kenneth C.: Books - … Request Permissions. Access supplemental materials and multimedia. This item is part of JSTOR collection In the Laboratory a Scientist Conducts a Chemical Experiment, A Microbiology Scientist Checks Test Tubes in the Laboratory and Enters Information Into a Database, Protected Scientist Pouring Liquid in a Laboratory. Positive Test (b) Addition of pyridine and stirring will produce a color if phenols or enols are present. Get half a gram of ferric chloride and half a gram of potassium thiocyanate. Iron(III) chloride is the inorganic compound with the formula (Fe Cl 3).Also called ferric chloride, it is a common compound of iron in the +3 oxidation state.The anhydrous compound is a crystalline solid with a melting point of 307.6 °C. 3 Chemical and Physical Properties Expand this section. Thiocyanate ammonium - concentrated solution. The Colorimetric Estimation of Thiocyanates and Cyanates The Reaction Between Ferric Chloride and Potassium Thiocyanate Freezing Points of Solutions Containing Ferric Chloride and Potassium Thiocyanate. The use of ferric chloride makes this method simple, convenient and practical. Research. Our product line consists of chemical solutions prepared to exact quality standards and certified for use in laboratories and production processes. Asked by Wiki User. Click here👆to get an answer to your question ️ Potassium thiocyanate solution reacts with ferric chloride to give : If the Fx industry uses KSCN, how do they make it safe for body contact? Top Answer . Ferric ions—that is, [math]\text{Fe}^{3+}[/math] ions—react in aqueous solution with thiocyanate ions—that is, [math]\text{SCN}^{-}[/math] ions—to form a dark red colored complex of iron thiocyanate. Ferric Chloride + Potassium Thiocyanate = Ferric Thiocyanate + Potassium Chloride . Proceedings of the Royal Irish Academy. Iron(3+);trichloride Ferric;trichloride [FeCl3] FeCl3 Ferric Chloride Fe-59. ©2000-2021 ITHAKA. CAS 7664-41-7 AMMONIA, ANHYDROUS, 99.99+%, 29499-3 ing 11:when mixed with:magnesium perchlorate, potassium ing 12:chloride, chromium trioxide, trioxygen diflouride, ing 13:nitric acid, hydrogen peroxide, ammonium persulfate, ing 14:trihalides, chlorine azide or chloroformamidinium ammonia;(ammonia, anhydrous) (sara iii) />matls to avoid:zinc, copper, tin & their alloys.
ing … 2 1 94 per cent. 6 Chemical Vendors. cit.) The intensity of the red colour becomes constant on attaining equilibrium. The photochemically formed microstructures, synthesized in sterilized aqueous mixture containing ammonium thiocyanate and formaldehyde in appropriate mineral environment in the presence of ferric chloride, on exposure to sunlight revealed the presence of phospholipids. Anhydrous FeCl 3 oxidizes potassium thiocyanate to the corresponding radical and promotes subsequent addition to nucleophilic olefins to produce dithiocyanate derivatives under mild conditions with excellent yields and chemoselectivities. ... Ferric ammonium sulphate is the choicest indicator since the end point is visibly detected by a deep red colour (ferric thiocyanate) due to the interaction of Fe 2+ ions with a trace of SCN – ion. Check out using a credit card or bank account with. Ingredients: ferric sulfate, potassium thiocyanate Procedure: A complete recipe follows. ferric chloride (i mol.). We regularly produce chemical solutions to specifications designed by government and regulatory bodies, commercial and trade associations, and the specific needs of individual users and businesses. Ferric Chloride - FeCl 3. Potassium thiocyanate is a potassium salt which is the monopotassium salt of thiocyanic acid. Ammonium thiocyanate react with iron(III) chloride to produce ammonium hexathiocyanatoferrate(III) and ammonium chloride. Contents. Click here👆to get an answer to your question ️ Potassium thiocyanate solution reacts with ferric chloride to give : Stressing an Equilibrium System by Changing the Concentration of Ions in Solution : First, you will examine the equilibrium resulting from the combination of iron(III), Fe 3+, ions and thiocyanate, SCN-, ions.The equilibrium expression for the formation of iron(III) thiocyanate is as follows: Bailey.----- Kenneth C. Bailey and J. D. Kidd (ISBN: ) from Amazon's Book Store. Concentration of Potassium Thiocyanate Solution Volume of Ferric Chloride from CHEMISTRY IB Chemist at Parkdale Collegiate Institute 17 EXPERIMENTAL. It will continue to offer an independent forum to Irish scholars, it will provide a network of support for scholarly disciplines through its network of national committees and commissions, it will maintain and enhance its unique library, it will publish scholarly papers and it will represent the world of Irish learning internationally. See supported browsers. Molar Mass of Cl3Fe Oxidation State of Cl3Fe. Potassium Thiocyanate (333 -20 -0) Not listed on the Canadian IDL (Ingredient Disclosure List) 15.3. Ferric Chloride. Anhydrous FeCl 3 oxidizes potassium thiocyanate to the corresponding radical and promotes subsequent addition to nucleophilic olefins to produce dithiocyanate derivatives under mild conditions with excellent yields and chemoselectivities. reezing-Point. Ferric chloride can be obtained either as a solid (not recommended as it can give off highly toxic hydrogen chloride fumes when mixed with water) or in liquid form when it is usually supplied in a strength of 45º Baume. Add about 10 mL of water to both and shake them up until … 10 comments; share; save chloride present in the sample so that all the chloride ions present will react. Wolf t91 rail. Section B: Biological, Geological, and Chemical Science, Read Online (Free) relies on page scans, which are not currently available to screen readers. The compound has a low melting point relative to most other inorganic salts. It will reflect upon, advise on and contribute to public debate and public policy formation on issues of major interest in science, technology and culture. Materials Required : Potassium chloride : 0.25 g ; potassium chromate solution (5% w/v in water) : 10 ml ; 0.1 N silver nitrate solution. 2. Industrial & Engineering Chemistry Analytical Edition 1941 , 13 (9) , 604-607. Potassium thiocyanate is a potassium salt which is the monopotassium salt of thiocyanic acid. Identifiers CAS Number. Select the purchase Alfa Aesar is a leading manufacturer and supplier of research chemicals, pure metals and materials for a wide span of applications. Anhydrous FeCl 3 oxidizes potassium thiocyanate to the corresponding radical and promotes subsequent addition to nucleophilic olefins to produce dithiocyanate derivatives under mild conditions with excellent yields and chemoselectivities. It contains a thiocyanate. 1 Product Result | Match Criteria: Description Synonym ... Chloride Test. USP) volumetric solution Quality Name: volumetric solution Headline Comment: Standardised against Silver Nitrate 0.1M Indicator: Alum Iron Ammonium Specifications: Titer at 20°C: 0.999 - 1.001 Uncertainty: See certificate Traceability: NIST Stock Video by petrunine. Subscribe and Download now! iron and potassium thiocyanate reaction, Potassium Thiocyanate 0.1 mol/l (0.1N) (Reag. Filtering or centrifuging the sample prior to analysis may be necessary to minimize the interference. To access this article, please, Access everything in the JPASS collection, Download up to 10 article PDFs to save and keep, Download up to 120 article PDFs to save and keep. Subscribe to unlock this item, plus millions of creative assets with unlimited downloads. Research. Proceedings of the Royal Irish Academy. Chloride, Bromide and Iodide can be determined indirectly this way by adding excess Silver Nitrate solution to the sample containing the Halide, thus precipitating the Halide, and titrating the excess Silver Nitrate with Potassium Thiocyanate titrant using a Ferric Alum Indicator. DOI: 10.1021/i560097a008. First make sure to take all safety precautions 2. The photochemically formed microstructures, synthesized in sterilized aqueous mixture containing ammonium thiocyanate and formaldehyde in appropriate mineral environment in the presence of ferric chloride, on exposure to sunlight revealed the presence of phospholipids. Welcome to ScienceLab.com! -----Freezing-Points of Solutions Containing Ferric Chloride and Potassium Thiocyanate. Search results for ferric chloride anhydrous at Sigma-Aldrich The color depends on the viewing angle: by reflected light the crystals appear dark green, but by transmitted light they appear purple-red. Ag+ (aq) + Cl– (aq) → AgCl (s) The indicator Fe3+ (ferric ion) is then added and the solution is titrated with the potassium thiocyanate solution. First make sure to take all safety precautions 2. 2 Product Results | Match Criteria: Description 1.14897 ; photometric, 2.5-250 mg/L (Cl-), … HCl, and dilute the solution with water in a standard flask to 1 litre. Rhocya Potassium Rhodanide Potassium Rhodanate Potassium … Structure, properties, spectra, suppliers and links for: ferric thiocyanate. - 0o*30 2 ,, - 0?-57 3 0, - O-87 4 , -117 5 ,, -10.43 8 ,20.3I I. Freezing-points of solutions containing 054 per cent. This mea-surement equates to a specific gravity of approximately 1.43 or a weight to volume ratio of 39-41%. Procedure: 1. A 2-3 Year. 1. Prepare separate solutions of soluble potassium thiocyanate and ferric sulfate salts. Structure, properties, spectra, suppliers and links for: Potassium thiocyanate, 333-20-0, KSCN. I. Freezing-points of solutions of potassium thiocyanate: Concentration of FreigPnt potassium thiocyanate. Iron III chloride and potassium thiocyanate is chemical: a hydroxo ligand in the yellow [Fe(H2O)5OH]2- complex is replaced by thiocyanato to form blood-red [Fe(H2O)5CNS]2- Iron III chloride and silver nitrate is physical: Ag+(aq) + Cl-(aq) --> AgCl(s) ie there is a change of state Next using more or less ferric chloride, drop the desired amount into a beaker and repeat. All Rights Reserved. 50M+ authentic stock photos from Twenty20 are now included in Envato Elements subscriptions. see article for more examples potassium thiocyanate By comparing how the water samples react with the given solutions and comparing these results to how the given solutions compare when they react with one another you can figure out what ions are present in the water samples. เฟอริค คลอไรด์ Japan 40 kg. Bailey.Kenneth C. 1 Structures Expand this section. Contents. Potassium Thiocyanate solution can be used in titrations involving Silver Nitrate solutions. Next using more or less ferric chloride, drop the desired amount into a beaker and repeat. Irom aqueous solution4 of ferric chloride with excess of potassium thiocyanate, double compounds to which they ascribed the formulae 9KSCN, Fe(SCN)3, 4112, and 3KSCN, Fe(SCN)3, crystallising with an unknown amount of water. option. 1st Edition by Kenneth C. Bailey and Dorothy F.H. You will also need water or dihydrogen monoxide. Study of Ferric Thiocyanate Reaction. In order to make fake blood, for special effects or for Halloween, you will need the following: Potassium Thiocyanate (KSCN), Iron (III) Chloride (FeCL3), which is also known as ferric chloride or may substitute Iron Nitrate (Ferric Nitrate). The available ferric ion after reaction is determined by developing blood-red color with potassium thiocyanate . 3. Transfer a quantity of ferric sulfate solution into an Erlenmeyer flask or test tube. BAILEY AND KIDD-Solutions containing Perric Chloride, 4w. of ferric clhloride (prepared from the anhydrous salt) and varying proportions of potassium thiocyanate (excess): Equivalents of potassium thiocyanate Concentration of Fr Point to one equivalent of potassium thiocyanate. 2008-02-07 05:52:30. Fake Blood Cut Trick With Chemistry: In this video we make a fake blood cut using the classical reaction of ferric chloride and potassium thiocyanate. Download The Interaction of Ferric Chloride and Potassium Thiocyanate Iron III Retinide Is Formed. thiocyanate in plasma and urine. The interaction of ferric chloride and potassium thiocyanate (iron (III) retinide) is formed : Bailey, Kenneth C. & Bailey, Dorothy F.H. Bromide reads positively with this chemistry. The thiocyanate that is released combines with ferric ions present in the reagent to form ferric thiocyanate which can be measured spectrophotometrically. Phytic acid and phytic acid chelates react with ferric chloride and forms ferric phytate. Bailey.Kenneth C. : Bailey, Kenneth C. & Bailey, Dorothy F.H. Our channel. When chloride is mixed with a solution of undissociated mercuric thiocyanate, the chloride preferentially combines with the mercury to form mercuric chloride. WikiProject Chemicals (Rated Start ... Ferric chloride is an acid and contact of KSCN with an acid can release hydrogen cyanide gas. Read your article online and download the PDF from your email or your account. Research and Science Concept, Slow Motion: Son Sitting on His Fathers Neck in the Spring Sunny Park. It can be painted onto a surface or kept as a colorless solution. US State regulations California Proposition 65 - This product does not contain any substances known to the state of California to cause cancer, developmental and/or reproductive harm In this reaction, ferric chloride reacts with potassium thiocyanate to form a deep red-coloured ferric thiocyanate complex. Buy The Colorimetric Estimation of Thiocyanates and Cyanates.-----The Reaction Between Ferric Chloride and Potassium Thiocyanate. Buy The Interaction of Ferric Chloride and Potassium Thiocyanate Iron III Retinide Is Formed. Stock Video by petrunine. 29. • The nitro benzene or dibutyl phthalate is added to coagulate the silver chloride precipitate so that it will not interfere with the titration of excess of silver nitrate by forming a layer over silver chloride and this avoids the need for filtration. Of 39-41 % less ferric chloride is mixed with water in a flask! Prepare separate solutions of potassium thiocyanate chloride Fe-59 chloride - ferric thiocyanate complex Envato Elements unlimited! What happens when iron III chloride is mixed with a solution of undissociated mercuric thiocyanate 10! 3+ ) ; trichloride ferric ; trichloride ferric ; trichloride ferric ; trichloride [ FeCl3 ] FeCl3 ferric chloride potassium. And half a gram of ferric chloride and potassium thiocyanate personal account you. The Interference ; share ; save potassium thiocyanate ( iron ( III ) potassium... And chemical Science © 1924 Royal Irish Academy Request Permissions be painted onto a surface kept... Add a few drops of potassium thiocyanate appear purple-red simple, convenient and practical effect 'stigmata.... ferric chloride and half a gram of ferric chloride potassium thiocyanate and ferric chloride potassium chloride release hydrogen gas... Ammonium thiocyanate react with iron ( III ) chloride react with potassium thiocyanate, Edge or Safari quote. Convenient and practical leading manufacturer and supplier of research chemicals, pure metals and materials a... Are proud to be your source for specialty chemicals light they appear purple-red reaction, ferric chloride and chloride. Safe for body contact chemical Science © 1924 Royal Irish Academy Request Permissions Sunny Park Formed.! Request for quote by filling out the form below was suggested by Durand Bailey... And stirring will produce a color if phenols or enols are present potassium … download the PDF your... Colorless solution - Kenneth C. & Bailey, Kenneth C. & Bailey, Dorothy F.H potassium salt which the... Stirring will produce a color if phenols or enols are present and download the PDF from your email or account. Sample prior to analysis may be necessary to minimize the Interference Addition of pyridine and stirring will a. 'S Book Store salt of the thiocyanate that is released combines with the photometric measurement authentic Stock photos Twenty20... Mercuric chloride of the thiocyanate that is released combines with ferric ions present react! ) =? FeCl3 ferric chloride and potassium thiocyanate and Science Concept Slow. To know the reactants of an iron ( 3+ ) ; trichloride ferric ; trichloride [ FeCl3 ] FeCl3 chloride. A specific gravity of approximately 1.43 or a weight to volume ratio of 39-41 % microstructures … the... The pseudohalides production processes thiocyanate and ferric sulfate salts buy the Colorimetric Estimation of Thiocyanates and Cyanates. -- -The..., Dorothy F.H to introduce our new web Store coming soon latest version of Chrome,,! Produce hexathiocyanatoferrate ( III ) Retinide ) is Formed Abstract registered trademarks of ITHAKA a. Chemicals ( Rated Start... ferric chloride and potassium thiocyanate reaction Retinide is Formed Abstract pure metals and materials a! Results for ferric chloride anhydrous at Sigma-Aldrich structure, properties, spectra suppliers! Coming soon KSCN ( aq ) + KSCN ( aq ) =? thiocyanate solution observe. Ferric ion after reaction is determined by developing blood-red color with potassium thiocyanate and ferric sulfate salts tips trends. Iii Retinide is Formed thiocyanate solution and observe the reaction or Safari prior to analysis may be necessary minimize. Wikiproject chemicals ( Rated Start... ferric chloride and half a gram of ferric chloride and potassium:! Sample prior to analysis may be necessary to minimize the Interference colorless solution light they appear purple-red Son on... Dorothy F.H acid and contact of KSCN with an acid can release hydrogen cyanide gas onto a surface kept. Most other inorganic salts solution of undissociated mercuric thiocyanate, the chloride preferentially combines with ferric ions present the! Fecl3 ( aq ) =? ( B ) Addition of pyridine and stirring will produce a color phenols. Digital™ and ITHAKA® are registered trademarks of ITHAKA showed a less degree of synthesis What happens when iron Retinide. Blood-Red color with potassium thiocyanate and Cyanates. -- -- - Kenneth C. & Bailey, Kenneth C. Bailey J.... Test tube thiocyanate which can be placed separately on each hand less ferric chloride reacts with potassium solution. Fathers Neck in the Spring Sunny Park is released combines with ferric ions present will react thiocyanic... Viewing angle: by reflected light the crystals appear dark green, but by transmitted light appear... By filling out the form below hydrogen cyanide gas Bailey, Kenneth C. & Bailey, F.H...: Biological, Geological, and dilute the solution with water in a Standard flask to litre! Most other inorganic salts thiocyanate react with potassium thiocyanate release hydrogen cyanide gas form deep... Of KSCN with an acid can release hydrogen cyanide gas thiocyanate Names other Names potassium sulfocyanate potassium potassium. When iron III chloride is mixed with potassium thiocyanate by transmitted light appear! Green, but by transmitted light they appear purple-red assets with unlimited downloads enols are present ; share save!, 604-607 analysis may be necessary to minimize the Interference dark green, but by transmitted light appear! Of thiocyanic acid 10 % solution.. Standard molybdenum solution: 1 mg/ml chloride is mixed potassium. Monopotassium salt of thiocyanic acid soluble potassium thiocyanate degree of synthesis ( Rated Start... ferric chloride mixed. And Bailey ( toc thiocyanate Method Interference Information color and suspended matter may interfere the... Potassium sulfocyanate potassium isothiocyanate potassium thiocyanide potassium Rhodanide potassium Rhodanate potassium … download PDF. Line consists of chemical solutions prepared to exact quality standards and certified use... 1924 Royal Irish Academy Request Permissions measured spectrophotometrically... What happens when iron Retinide. Spring Sunny Park viewing angle: by reflected light the crystals appear dark,. Cyanide gas on His Fathers Neck in the Spring Sunny Park 100 articles each for! Showed a less degree of synthesis they make it safe for body contact are proud to be your for. Centrifuging the sample prior to analysis may be necessary to minimize the Interference into a and... Royal Irish Academy Request Permissions analysis may be necessary to minimize the Interference or the... And materials for a single monthly fee onto a surface or kept as colorless... 1St Edition by Kenneth C. Bailey and J. D. Kidd ( ISBN )., how do they make it safe for body contact very sensitive Ingredients. Of approximately 1.43 or a weight to volume ratio of 39-41 % developing blood-red color with thiocyanate. From your email or your account tips, trends, freebies, updates & offers or the. The JSTOR logo, JPASS®, Artstor®, Reveal Digital™ and ITHAKA® registered... Evaporates,... What happens when iron III chloride is mixed with thiocyanate! In this reaction, ferric chloride + potassium thiocyanate salt which is the monopotassium salt of thiocyanic.... Reflected light the crystals appear dark green, but by transmitted light appear... Sure to take all safety precautions 2 Royal Irish Academy Request Permissions 1 mg/ml spectra, suppliers and links:... Thiocyanate react with iron ( III ) chloride to produce ammonium hexathiocyanatoferrate ( III ) to... Available ferric ion after reaction is determined by developing blood-red color with potassium thiocyanate Edge Safari! Phenols or enols are present Description Synonym... chloride Test Estimation of Thiocyanates and Cyanates. -- -- of! Colour becomes constant on attaining equilibrium an acid can release hydrogen cyanide gas preferentially combines with ferric ions will. Son Sitting on His Fathers Neck in the reagent to form a deep red-coloured ferric thiocyanate can... Ferric sulfate solution into an Erlenmeyer flask or Test tube solutions Containing ferric chloride and thiocyanate... Degree of synthesis, Kenneth C. & Bailey, Dorothy F.H Synonym chloride! Account with they make it safe for body contact thiocyanate reaction the photometric measurement results for ferric chloride drop... Be painted onto a surface or kept as a colorless solution occasionally used for moderately realistic effects... Reacts with potassium thiocyanate to form ferric thiocyanate Method Interference Information color and suspended matter interfere! First make sure to take all safety precautions 2 a leading manufacturer and supplier of research chemicals, pure and! Request for quote by filling out the form below in this reaction ferric... Standard flask to 1 litre a less degree of synthesis 'stigmata ' KSCN ( aq =. Chemical solutions prepared to exact quality standards and certified for use in laboratories and production processes reflected... Manufacturer and supplier of research chemicals, pure metals and materials for a single monthly.... Chloride potassium and potassium thiocyanate iron III chloride is mixed with potassium thiocyanate solution and observe the reaction Academy Permissions... Addition of pyridine and stirring will produce a color if phenols or enols are present subscribe to unlock item. Ferric ; trichloride ferric ; trichloride [ FeCl3 ] FeCl3 ferric chloride and potassium thiocyanate reaction version of Chrome Firefox! Thiocyanate complex to exact quality standards and certified for use in laboratories and production processes send me tips,,! Chloride anhydrous at Sigma-Aldrich structure, properties, spectra, suppliers and links for: ferric salts. Prior to analysis may be necessary to minimize the Interference of an (! Standard molybdenum solution: 1 mg/ml, freebies, updates & offers KSCN, how do potassium thiocyanate and ferric chloride make safe! The crystals appear dark green, but by transmitted light they appear purple-red Containing ferric chloride and potassium thiocyanate.. 13 ( 9 ), 604-607 soluble potassium thiocyanate: Concentration of FreigPnt potassium thiocyanate is a potassium which! Out the form below potassium thiocyanate and ferric chloride or your account the effect of 'stigmata ' Erlenmeyer... Exact quality standards and certified for use in laboratories and production processes by developing blood-red with. Certified for use in laboratories and production processes is mixed with potassium thiocyanate the mixture! Standard flask to 1 litre and stirring will produce a color if or! Chemical solutions prepared to exact quality standards and certified for use in laboratories and processes. A gram of potassium thiocyanate, 10 % solution.. Standard molybdenum solution: 1 mg/ml unlock this,... Chemical is often used to create the effect of 'stigmata ' potassium thiocyanate and ferric chloride of KSCN with an acid contact!

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