Every year we make playdough during the first week of school. It is a simple first cooking project, has such wonderful sensory components to it, isn't affected by food allergies and we don't buy playdough so...
we NEED to make it.
As Bev Bos has said, children need lots and lots and lots of materials! So we make a ton of playdough, at least a batch or two a day for several days. In the past, we have made it one color. It is pretty impressive to see the HUGE mound of playdough on the table from which children take chunks for their play.
This time we made four different colors. The playdough was placed in large clumps on the table along with a few tools.
At first the children played with individual colors separately. Then one child started adding bits and pieces of other colors and the exploration took off from there. Soon we had tie dyed playdough.