When you mix the dry ingredients you make a mixture — look at it with a hand lens, or USB microscope, and talk about how it can be physically separated back out using a fine sieve. Mix the water and food colouring, making a solution. You can add oil and show that it won’t mix in — link to density and miscibility…… This resource is for teachers, learners, parents and carers to use in Sciences for Early: age 3 to P1 (3-6 years old) First: P2-P4 (5-9 years old) Second: P5-P7 (8-12 years old).
http://www.chem.ed.ac.uk/sites/default/files/outreach/experiments/Playdough_details_branded.pdf
Chemistry Public Engagement and Outreach Team