I have found it very easy to colour and recently we have taken to using it to explore a rainbow of colours.
The only part of out rainbow yet to be completed is blue /purple as I have found these harder to dye the rice and have always ended up with a grey colour.
To dye rice for play activities:
You will need;
1 cup of rice
1 tbsp of white vinegar
couple of drops of food coloring (I like the gel ones best as they give a stronger colour)
Place the ingredients in a large seal able plastic box.
Place the lid on firmly and shake until all the rice is well coated.
Tip out on to a couple of baking trays and spread out.
Leave to dry overnight - the vinegar smell disappears!