sodium 7-phenyl-5,9-bis(phenylamino)-4,10-disulphonatobenzo[a]phenazinium

Such a dye salt was commercially available as Irisol Fast Blue BLN [6378- 88-7] for dyeing nitrocellulose lacquers. This dye is also suitable for dyeing and printing of synthetic polyamides from organic solvents, in particular chlorinated hydrocarbons. Supranol Blue GL is similarly used to prepare Irisol Blue GLE. The dyes can be reduced to leuco compounds, which can be used to check the packaging of foodstuffs stored under oxygenfree conditions with regard to imperviousness of the packaging.

6,8-Bis(phenylamino)naphthalene-1-sulfonic acidand 5-Amino-2-(phenylamino)benzenesulfonic acid condensation, its product to (add) ammonia of cuprous oxide as the catalyst for air oxidation.

Aciderm Blue EBL (Bayer), Benzyl Blue BL

Weakly basic solutions containing 0.87 kmol of 1,3-bis(phenylamino) naphthalene-8-sulfonic acid in 1700 L of water and 0.9 kmol of 4-aminodiphenylamine-2- sulfonic acid in 1000 L of water are combined in a 10000 L iron kettle equipped with a propeller stirrer (95 rpm), and a solution containing 35 kg of copper sulfate and 40 kg of 40% ammonia in 130 L water is added, followed by 40 kg of ammonium chloride and 3500 L of ethanol. After dilution to 7000 L with water, air is blown through the mixture at 40 ℃ for 6 h. Then, the reaction mixture is allowed to cool to 25 ℃ and salted out with 2000 L of 25 % common salt solution. After the mixture is filtered through a suction filter under pressure, the press cake is washed twice with cold water.

red light blue. Red light blue powder, easily soluble in water, but soluble in ethanol (for purple) and soluble fiber element, insoluble in benzene, toluene. The strong sulfuric acid dyes are green, diluted into red light blue; In nitric acid are Deep violet color. The water soluble for blue, add sodium hydroxide to red brown, precipitation; Add hydrochloric acid to purplish blue, precipitation. In dyeing iron ion turned dark colored, copper ions in the dark colored. Used for wool, silk, polyamide fiber and its blending fabric, the influential wool fabric dyeing and printing directly, can also be used for leather, nitro cellulose paint color. The heavy metal salt can be used as organic pigments used to paint.

Standard	Light Fastness	Soaping		Persperation Fastness	Oxygen bleaching		Fastness to seawater
		Fading	Stain		Fading	Stain	Fading	Stain
ISO	4	2-3	2-3	4	1	1	4	3
AATCC	3	2-3	2-3	3-4	1		4-5	4-5