**2.4 Microbes**

Microbes like *Monococous* sp. (Carotenoids) *Dunaliella salina* and *Blakeslea trispora* (β-carotene) *Arthrospira platensis* (*spirulina* bacteria) produce certain bio-colours. Phycobiliproteins, algae belonging to Rhodophyta and Chlorophyta produces red and blue colours.
