I am trying to recreate an experiment for which I have lost the original source. The basic idea is to expose bacteria on petri plates to uv radiation sufficient to prevent most growth. One half of the plate is covered with sunscreen to see if it provides any protection from uv damage.
Students can compare different brands and different spf's.
Unfortunately, the petri dishes that we are using reflect uv radiation. We get growth on our controls even at 30 minute exposures. Glass should also block uv wavelengths. I'd appreciate hearing from anyone who has done this experiment or who knows where I can find the source. Bowling Green State University Bowling Green, OH 43403 Charlene, A cheap and readily available UV-B transmitter is Saran wrap.