Difference between pages "Cobaltic oxide" and "Siderin yellow"

Latest revision as of 08:28, 31 May 2022

Description

A yellow pigment composed of Iron chromate. Iron chromate is precipitated from a solution of a chromate salt, such as Potassium dichromate by the addition of Ferric chloride. The pure pigment is bright yellow, but some residual impurities, such as iron oxide, may result in a dull orange pigment color. Siderin yellow is compatible with all paint binders. It has also been used as a brown ceramic glaze and as a colorant in glass and enamel.

Synonyms and Related Terms

iron chromate; ferric chromate; Pigment Yellow 45; CI 77505

Risks

Human carcinogen.
Skin contact may cause allergies.
Acute ingestion may cause fatal chromium poisoning.
Chronic inhalation may cause lung cancer and respiratory irritation
Ceramic Shop: SDS

Physical and Chemical Properties

Soluble in acids. Insoluble in water, ethanol.

Composition	Fe2(CrO4)3
CAS	10294-52-7

Resources and Citations

H. Kuhn, M.Curran, "Chrome Yellow and Other Chromate Pigments", Artists Pigments, Volume 1, R. Feller (ed.), Cambridge University Press: Cambridge, 1986.

Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993

Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979

The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983

@@ Line 1: / Line 1: @@
-[[File:Cobalt black C100x.jpg|thumb|Cobalt black at 100x (visible light left; UV light right)]]
 == Description ==
-A naturally occurring black powder. Cobaltic oxide is used to give a brilliant blue color glaze and enamel. Cobalt oxide was used as a blue colorant in ceramic glazes and underglazes since at least the 8th century in the Middle East. It became very popular in the 14th century when it was used for Ming Dynasty ceramics. Cobaltic oxide is not used as a black paint pigment.
+A yellow pigment composed of [[iron chromate]]. Iron chromate is precipitated from a solution of a chromate salt, such as [[potassium%20dichromate|potassium dichromate]] by the addition of [[ferric%20chloride|ferric chloride]]. The pure pigment is bright yellow, but some residual impurities, such as [[ferric%20oxide|iron oxide]], may result in a dull orange pigment color. Siderin yellow is compatible with all paint binders. It has also been used as a brown ceramic glaze and as a colorant in glass and enamel.
 == Synonyms and Related Terms ==
-cobalt black; cobalt oxide; óxido de cobalto (Esp., Port.); oxyde de cobalt (Fr.); ossido cobaltico (It.); black oxide of cobalt; cobalt blue glaze
+iron chromate; ferric chromate; Pigment Yellow 45; CI 77505
-[[[SliderGallery rightalign|PIG513.jpg~XRD|f513sem.jpg~SEM|f513edsbw.jpg~EDS|Slide16 F513.PNG~XRF]]]
 == Risks ==
-* Skin contact may cause allergies, especially on elbows, neck and ankles.
+* Human carcinogen.
-* Chronic inhalation may cause asthma.
+* Skin contact may cause allergies.
-* Ingestion may cause vomiting, diarrhea and the sensation of hotness.
+* Acute ingestion may cause fatal chromium poisoning.
+* Chronic inhalation may cause lung cancer and respiratory irritation
+* Ceramic Shop: [https://www.theceramicshop.com/sds/IronChromate.pdf SDS]
 ==Physical and Chemical Properties==
-* Soluble in concentrated acids. Insoluble in water.
+Soluble in acids. Insoluble in water, ethanol.
 {| class="wikitable"
 |-
 ! scope="row"| Composition
-| Co2O3 or Co3O4
+| Fe2(CrO4)3
 |-
 ! scope="row"| CAS
-| 1308-04-9
+| 10294-52-7
-|-
-! scope="row"| Melting Point
-| 895 C (dec)
-|-
-! scope="row"| Density
-| 4.81-5.60 g/ml
 |}
 ==Resources and Citations==
-* Ralph Mayer, ''A Dictionary of Art Terms and Techniques'', Harper and Row Publishers, New York, 1969 (also 1945 printing)
+* H. Kuhn, M.Curran, "Chrome Yellow and Other Chromate Pigments", ''Artists Pigments'', Volume 1, R. Feller (ed.), Cambridge University Press: Cambridge, 1986.
 * Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993
+* Michael McCann, ''Artist Beware'', Watson-Guptill Publications, New York City, 1979
+* ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983
 [[Category:Materials database]]