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science fair idea: Make rainbow roses by splitting the stems into strands and placing each one in food coloring. The roses draw the food coloring into the petals.

from HubPages

How to make Rainbow Roses: a Step by Step Guide

HOW TO MAKE A RAINBOW ROSE: Obtain a perfect white rose with 8-9 inches stem. Cut the end of the stem into 4 equal parts and up 6 inches. Dip the 4 stems ends into 4 cups of food coloring & wait for 24 hours. I suggest these color combinations: red-blue-green-yellow... violet-red-blue-yellow... or yellow-purple-grey-blue. Go to website for more detailed instructions. Fun for the babes!

I always wanted to paint pictures on stones, then put them back outside to be found & wondered about by someone else.

"Ice Tunnels" combine ordinary salt, ice and liquid watercolors in an unforgettable art and science experiment that costs only pennies. Try this on sunny day with lots of bright sunlight and you'll experience amazing color, light refraction and salt crystallization with a hands-on experience for children of all ages.

DIY Kool Aid and Food Coloring Tattoo. Instructions: 1 packet orange Kool-Aid, 1 drop green food coloring, 1 cup water. Paint on, let sit for 1 minute, pat dry. Lasts over a week. So I could "trial-run" a tattoo!.