Ingredients - Cornflour and water. Food colouring optional.
Equipment - Container, bowl or plate, something to mix ingredients or you can use your hands.
Mix cornflour with water to make 'Gloop'. If you want to colour your 'Gloop' add some food colouring to your water before mixing ingredients together. Thoroughly mix. It will be runny when in a bowl etc and go solid at first when picked up. Let it run through your hands back into the bowl. it clears up quite well from surfaces when we play with it at a table.