Pigment Yellow 42

• CAT Number: M017719
• CAS Number: 51274-00-1
• Molecular Formula: Fe2O3
• Molecular Weight: 159.69
• Purity: ≥95%
• Synonyms: C.I.Pigmentyellow42;Transparentironoxideyellow;RAW UMBER;ROUGE;SIENNA BURNT;SIENNA;NR RED IRON OXIDE;YELLOW FERRIC OXIDE
• Storage: -20°C
• InChI: InChI=1S/Fe.2H2O.O/h;2*1H2;/q+3;;;-2/p-1
• InChIKey: LDHBWEYLDHLIBQ-UHFFFAOYSA-M
• SMILES: O.[OH-].[O-2].[Fe+3]

Pigment Yellow 42 (CAS 51274-00-1), also known as Yellow Iron oxide, is a yellow powder in the form of an alkaline oxide with comparatively stable chemical properties. It is insoluble in water and alcohol, slightly soluble in acids but completely dissolves in concentrated hydrochloric acid. It is used in coating, printing ink and paint, and also as a coloring agent for building material, rubber and paper-making. It is widely used due to its bright and pure colour, good weather proofing and high opacity. It is manufactured by the precipitation of ferric oxide hydroxide followed by purification through washing, drying and milling.

Reference

1.Wang, Hongxia, et al. "Rheological properties, antimicrobial activity and screen-printing performance of chitosan-pigment (FeO (OH)· xH2O) composite edible ink." Progress in Organic Coatings 111 (2017): 75-82.
2.Dietz, Erwin, Albert Munkel, and Ferdinand Memmel. "Pigment dispersions, processes for their preparation and their use." U.S. Patent No. 4,986,851. 22 Jan. 1991.