Indoors--Transparent white color
At sunset and rainy day outdoors --- light colorful
Sunny day -- super dark colorful
When absorb and store light from sun and lamp, they will glow in the dark!!
Make exciting and safe UV detector bracelets. Great for camp projects. Assorted colors. This is a wonderful way to study solar energy. This kit allows young children to experiment with the concepts of reversible photochemical reactions.