C.I. Direct Orange 63

(E)-2-(2-sulfo-4-nitrostyryl)-5-nitrobenzenesulfonic acid diazo, coupled with phenol, again, then methylation hydroxyl with glucose will nitro reduction.

bright orange. Soluble in water for gold orange, slightly soluble in alcohol. The strong sulfuric acid for navy, Red sauce for diluted. The dye solution to join strong hydrochloric acid for hidden cyan, have precipitation. Add thick sodium hydroxide solution for red orange, precipitation.

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