Features:
1) Bag contains 1 pound of mixed longwave fluorescent minerals.
2) Sizes range from 1 x .5-inch to 1/8 x 1/8-inch (smaller sand sizes best for art work).
3) Comes with a label providing mineral names based on fluorescent color response.
4) Minerals will fluoresce under common black light as well (although filtered UV light is best).
5) Some minerals will also fluoresce under shortwave ultraviolet light.