Chemistry In Everyday Life

Concept: Indigo is a natural dye obtained from plants like \textit{Indigofera} and is widely used for coloring fabrics. Step 1:Understand its primary use.
Indigo is mainly used as a blue dye, especially in:

• Textile industry
• Denim (jeans) production

Step 2:Eliminate incorrect options.}

• Perfumery Not related
• Pharmaceutical Not a primary use
• Food industry Not used

Final Answer: