Indulin
a term applied commercially to a series of aniline colors, obtained by treating the bases of magenta refuse with aniline and acetic acid.
There are two kinds of indulin, the one soluble in alcohol, the other in water.
Spirit-soluble indulin dyes wool, silk, and cotton different shades of blue or gray. The water-soluble indulins dye fabrics light and dark shades of gray, even approaching black; but the blacks are not satisfactory either in color or durability.
INDUS