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The Collaborative International Dictionary
Nigrosine

Nigrosine \Ni"gro*sine\ (? or ?), n. [From L. niger black.] (Chem.) A dark blue dyestuff, of the induline group; -- called also azodiphenyl blue.

Wiktionary
nigrosine

n. A dark blue synthetic dyestuff of the induline group.

Usage examples of "nigrosine".

Acid black, Naphthol black, Naphthol green, Nigrosine, Fast blue, Water blue, and some others dyed in an acid bath, but little more than half the dye used on unchlored wool is required, while with Induline, more even and intense shades are obtained than is otherwise possible.

Such inks are made from a fine, cheap powder, of which nigrosine is used in making black inks, eosine for red, and methylene for blue ink, and they cost only a few dimes a gallon to manufacture.

Naval Research Laboratory tests, was a combination of copper acetate and a dark nigrosine dye, and cakes of this mixture were apparently now attached to the Mae Wests of all the U.

The soluble indulines and nigrosines differentiate in appearance, the first a bronzy powder and the latter a black lustrous powder.

Naval Research Laboratory tests, was a combination of copper acetate and a dark nigrosine dye, and cakes of this mixture were apparently now attached to the Mae Wests of all the U.