Hi, this is our way of tackling this issue, * give only an Appropriate quantity to play with,  do not give everything at once. * try and give combinations of primary colors together so that we get a secondary color that can be used. *Always teach your child to respect love and use the creations he makes. It could be mixed colors or anything that he makes out of his art and craft projects everything is used and not thrown. *While we make creations we mostly try not to press two different colors on each other we try to keep it soft so the colors don’t mix. *And while putting DoughReMom back we segregate the like colors and then give them a good mix. *Yes sometimes we have different colors mixed to give us a very dark color which may not be soothing to the eye. But we try and use it for different purposes sometimes to make the hair, or the road or the mountains. Just by having an open perspective on things and by inspiring your child to do so. – That’s one of the reasons for Playdough being called an open-ended toy because there is no right or wrong way to use it!