Chemical Properties
bordeaux to violet or black powder
Preparation
Formaldehyde?(or Methanol and Sodium nitrite) and 2-Hydroxybenzoic acid concentrated sulfuric acid in the reaction.
Definition
ChEBI: An organic sodium salt that is the trisodium salt of 3,3'-[(3-carboxy-4-oxocyclohexa-2,5-dien-1-ylidene)methylene]bis(6-hydroxybenzoic acid).
Properties and Applications
red light purple. Soluble in water for dark red, not soluble in ethanol. In concentrated sulfuric acid for brown, dilution after precipitation. Dye aqueous solution to join sodium hydroxide as brilliant brown.
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Standard(cotton)
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Ironing Fastness
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Light Fastness
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Fulling
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Persperation Fastness
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Soaping
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Water
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Alkali
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Acid
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ISO
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2-3
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4-5(40℃)3(100℃)
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