1. a blue or blue-black dye derived from aniline, used in textile dyeing and as a biological stain
Usage: chemistry; technical

Examples

• The laboratory used indulin to stain the tissue samples for microscopic examination.
• Indulin produces a deep blue color when applied to cotton fabrics.
• The chemist prepared an indulin solution for the dyeing process.
• Indulin is commonly used in histological studies as a nuclear stain.
• The textile factory ordered several pounds of indulin for their blue dye production.