tetrasodium 3,3'-[carbonylbis[imino(5-methoxy-2-methyl-4,1-phenylene)azo]]bis(naphthalene-1,5-disulphonate)

Direct yellow 34 is a good dyeing agent for cotton fabrics.

3-Aminonaphthalene-1,5-disulfonic acid diazo, and 2-Amino-4-methylanisole coupling, and then make the light gasification.

Not classified

red light yellow. Soluble in water for orange. The strong sulfuric acid for blue, blue black after diluted precipitation. The dye solution to join strong hydrochloric acid have blu-ray black precipitation; Add 10% sodium hydroxide solution have yellow precipitation. Used for cellulose fiber dyeing, paper color.

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Soaping		Water
				Fading	Stain	Fading	Stain
ISO	3	5	6-7	2-3		3
AATCC	4-5	3	5	3-4	3

[1] Sawada K, Ueda M. Adsorption behavior of direct dye on cotton in non-aqueous media[J]. Dyes and pigments, 2003, 58(1): 37-40.