“Turmeric powder, flowers of marigold and flame of the forest, raw waste of beetroot and spinach and kattha used in paan are used as ingredients to obtain colour pigments."
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/organic-colours-make-splash-holi-mumbai
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-mumbai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/maharashtra
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/festival
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/holi
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ngo
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/farmers
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environmental-security
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-care
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment