Another thing to consider is that UV-C will be much stronger than UV-A or UV-B, which would be the majority of what the sunlight was transferring to the tincture. UV-C is actually almost non-present in the sunlight that reaches us. UV-C may work way better, or it may actually come with some negative side effects. Experimentation with each type of UV separately sounds to be in order, not only to see which destroys chlorophyll most effectively, but also with the smallest loss or isomerization of our target. I have a couple pretty strong 365nm UV-A flashlights with filter glass that only lets out UV-A light. I’ll have to make some green dragon and hit it with the lights for a while to see what UV-A only will do.
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