1. A dark blue or black synthetic dye used in inks, paints, and textiles.
Usage: Also called nigrosin; primarily used in industrial and commercial applications.

Examples

• The printer's ink contained nigrosine to achieve a deep black color.
• Nigrosine is commonly used in the manufacture of ballpoint pen ink.
• The textile factory added nigrosine to the dye vat for dark blue fabric.
• Artists sometimes use nigrosine in watercolor mixtures for rich, dark tones.
• The pigment nigrosine provides excellent lightfastness in commercial applications.