Take gram flour and turmeric powder and mix it thoroughly. Rub it between your palms and pass it through a sieve three to four times for a smooth texture.
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Green
Mix henna powder with refined flour or rice flour for a natural green colour. Remember that henna when mixed with water can stain the skin.
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Red
Dry red hibiscus flowers and grind them into a fine powder, then add flour according to your preference to make the colour dark or light.
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Purple
You can make purple by grinding black carrots and mixing them with corn flour. Leave the mixture to dry.
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Magenta
You can get a vibrant magenta colour by boiling beetroot in water. Cut into slices and boil properly, let it cool and you have natural magenta water for Holi.