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their are chemicals in holi colours:
Green colour is obtained from copper sulphate -which may cause allergies in eye or even temporary blindness.

Purple is obtained from chromium iodide - which may cause bronchial asthma or other forms of allergy.

Silver is obtained from aluminum bromide - a known carcinogenic.

Black is obtained from lead oxide - may cause renal failures or learning disability. 

Red is obtained from mercury sulphite - may cause skin cancer or Minamata disease (mental retardation, paralysis, impaired vision...) 

Shiny Colours are a result of powdered glass being added to the colours. 
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