You can do a leaf print. Use a fresh green leaf. Lay on a board and piece of
bleached muslim on top. Pin the muslim to the board with thumbtacks. Use a
small mallet and hot the material. The cholorphyl makes a great print. I've
done this with pre-schoolers.
Color mixing.
Need six clear cups, food coloring, eye droppers, water.
Fill three cups half-way with red, yellow, blue food coloring mixed with
water.
Fill the other three cups half-way with clear water.
Put two dots on each cup. 1. red-blue 2 red-yellow 3 blue-yellow
Let the kids drop the food coloring into the clear cups and watch the
reaction.