Agent Name

Aurin

CAS Number

603-45-2

Formula

C19-H14-O3

Major Category

Dyes

Synonyms

4,4'-Dihydroxyfuchsone; Aurin No. 555; Aurine; C.I. 43800; Corallin; Corallin Spirit Soluble; Spirit Aurine; p-Rosolic acid; 2,5-Cyclohexadien-1-one, 4-(bis(4-hydroxyphenyl)methylene)-; 4-(Bis(p-hydroxyphenyl)methylene)cyclohexa-2,5-dien-1-one; [ChemIDplus] 4-[Bis(4-hydroxyphenyl)methylene]-2,5-cyclohexadien-1-one; 4-(p,p'-Dihydroxybenzhydrylidene)-2,5-cyclohexadien-1-one; [Merck Index]

Category

Di- and Triaryl Dyes

Description

Deep red solid; Technical product may be yellowish-brown with a dark green metallic fracture; [Merck Index] Dark red powder; [Sigma-Aldrich MSDS]

Sources/Uses

Used as a dye intermediate; [Merck Index] "Aurin (C.I. 43800), sometimes named rosolic acid or corallin is an organic compound, forming yellowish or deep-red crystals with greenish metallic luster. It is practically insoluble in water, freely soluble in alcohol. It is soluble in strong acids to form yellow solution, or in aqueous alkalis to form carmine red solutions. Due to this behaviour it can be used as pH indicator with pH transition range 5.0 - 6.8. It used as intermediate in manufacturing of dyes." [Wikipedia]

Comments

A moderate irritant; [Sigma-Aldrich MSDS]

Exposure Assessment
Vapor Pressure

1.02E-10 mm Hg

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