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Thanks to Sarah for sending this in!
Mix sugar and cornstarch together in a medium saucepan over low heat.
Add cold water and continue stirring until the mixture is thick.
Remove from heat.
Divide the mixture up into four empty margarine containers.
Add a drop or two of food colouring and a pinch of soap flakes or a drop of detergent to each container and mix.
Use a different colour for each cup.
Stir and let cool.
Store covered in an airtight container.