- Dye named for a country with a colour associated with denim
– Ans: Indigo
- Reddish-purple dye secreted by Muricidae molluscs
– Ans: Tyrian purple
- Dye whose name comes from Sanskrit for “made by worms”
– Ans: Kermes
– Ans: Indigo
– Ans: Tyrian purple
– Ans: Kermes
Introduction Stubble burning, the practice of setting fire to leftover crop residue after harvest, is …