Ultraviolet-Detecting-Beads-RVFM-EDU1249-These-UV-sensitive-beads-turn-from-white-to-varying-bright-colours-when-exposed-to-sunlight-or-other-UV-sources-The-beads-can-be-used-for-example-to-test-the-effectiveness-of-UV-protection-in-sunglasses-or-to-create-a-simple-bracelet-etc-which-can-function-as-a-UV-detector-RVFM-UV-Detecting-Beads-Pack-of-100