I do not mention the amounts of sugar or food colouring as you can add more food colour for more intense colour or add more sugar for brighter colour. So, Pour the sugar in the plastic bag. Add some drops of food colouring to the sugar.

Seal the bag, shake the bag and knead the sugar in the bag until food colour and sugar mixed well.

Pop it into a baking tray. Lined with parchment paper. Spread it in on the tray and cook it in 50C degree for 5 minutes.

Or pop it in a pan and heat it for 2 minutes.

Once the sugar is cooled down or dried. Break all lumps with your fingers or place it into a strainer and shake it until we get all of sugar out of strainer.

The coloured sugar in the bag are my purchased colour sugar and you can see there is no difference between my home made coloured sugar with those.