Food colouring combined with talcum powder or cornflour can be used to create a blue colour. But here’s a natural way to make it if you do not want to use food colouring.

To create a vivid blue hue at home, gather the following materials:

• Neeli gulmohar flower
• Cornflour or talcum powder

Steps:

• Neeli gulmohar has bright blue blooms in the summer and can be used to create blue hues for Holi.
• Let the neeli gulmohar flowers dry first. 
• Give it a good grinding and combine it with talc or cornflour.