2-3 drops food colouring
2 tbsp white glue (elmers works best rather than the knockoffs)
Combine the white glue and food colouring in small bowl. Pour the liquid starch into a second small bowl. Slowly pour the glue mixture over the liquid starch.
Let the putty mixture stand until the glue completely absorbs the liquid starch. Knead the putty the desired consistency is reached.
Store in a plastic Easter Egg or small ziploc bag.