Difference between pages "Cobaltous phosphate" and "Siderin yellow"

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[[File:Covioletd C100x.jpg|thumb|Cobalt violet dark]]
 
 
== Description ==
 
== Description ==
  
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A medium to strong violet pigment with a reddish hue. Cobaltous phosphate, or [[cobalt violet, deep|deep cobalt violet]], was first prepared in 1859. It is a permanent pigment but it has low tinting strength. It dries quickly in [[oil paint|oil paints]]. Cobaltous phosphate is also used as a colorant in [[glass]], [[glaze|glazes]], [[enamel, inorganic|enamels]], and [[plastic|plastics]].
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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.
  
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[[[SliderGallery rightalign|Cobalt Violet, dark (498).PNG ~FTIR (MFA) (Forbes 498)|Cobalt violet (Forbes MFA 498), 50X, 532 nm.TIF~Raman (MFA) (532nm)|Cobalt violet dark (Forbes MFA 498), 785nm resize.tif~Raman (MFA) (785nm)|f498sem.jpg~SEM (MFA)|f498edsbw.jpg~EDS (MFA)]]]
 
 
== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==
  
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cobalt phosphate; Pigment Violet 14; CI 77360; fosfato de cobalto (Esp., Port.); violeta de cobalto (Esp.); phosphate de cobalt (Fr.); fosfato di cobalto (It.); cobalt violet, deep
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iron chromate; ferric chromate; Pigment Yellow 45; CI 77505
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== Risks ==
 
== Risks ==
  
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* Skin contact may cause allergies, especially on elbows, neck and ankles.
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* Human carcinogen.
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* Chronic inhalation may cause asthma.
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* Skin contact may cause allergies.  
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* Ingestion may cause vomiting, diarrhea and the sensation of hotness.
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* Acute ingestion may cause fatal chromium poisoning.  
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* NIH: [https://pubchem.ncbi.nlm.nih.gov/compound/Cobalt_II_-phosphate Information shet]
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* Chronic inhalation may cause lung cancer and respiratory irritation
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* Ceramic Shop: [https://www.theceramicshop.com/sds/IronChromate.pdf SDS]
  
 
==Physical and Chemical Properties==
 
==Physical and Chemical Properties==
  
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Soluble in mineral acids. Insoluble in water.
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Soluble in acids. Insoluble in water, ethanol.
  
 
{| class="wikitable"
 
{| class="wikitable"
 
|-
 
|-
 
! scope="row"| Composition
 
! scope="row"| Composition
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| Co3(PO4)2 - 8H2O
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| Fe2(CrO4)3
 
|-
 
|-
 
! scope="row"| CAS
 
! scope="row"| CAS
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| 13455-36-2
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| 10294-52-7
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|-
 
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! scope="row"| Density
 
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| 2.769 g/ml
 
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|-
 
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! scope="row"| Molecular Weight
 
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| mol. wt. = 366.74
 
 
|}
 
|}
  
 
==Resources and Citations==
 
==Resources and Citations==
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* 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
 
* Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993
  
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* Random House, ''Webster's Encyclopedic Unabridged Dictionary of the English Language'', Grammercy Book, New York, 1997
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* Michael McCann, ''Artist Beware'', Watson-Guptill Publications, New York City, 1979
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* ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983  Comment: entry 2508
 
  
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* Thomas B. Brill, ''Light Its Interaction with Art and Antiquities'', Plenum Press, New York City, 1980
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* ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983
  
  
  
 
[[Category:Materials database]]
 
[[Category:Materials database]]

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

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