– Gallon freezer sealable bag – Permanent markers in all the rainbow colors – Anti-bacterial hand gel – Transparent color counters – Clear packing tape
Draw a rainbow on the bag using permanent markers. Then place counters on the bag so you know how many of each color you'll need.
Then add a cup of hair gel or hand sanitizer to the bag, add the counters and seal the bag. Tape to a white surface along the top and bottom of the bag.
Now recreate the rainbow by moving the counters inside the bag to match the lines drawn on the bag!