Early morning sky the other day was anything but blue. Sunrise wasn't going to let overcast contain all the light - the yellow peaking howdt through green/grey is a bonus - seen only because the camera flash didn't go off. Color is such a nifty event. Had a conversation about vasoline glass, a collectible type of silica material used in the early 20th century. It contains 2% uranium oxide, which causes it to fluoresce under a black light. It likely produces low levels of radioactivity, but most of that goes on to do no harm. Or so we hope.
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