I just watched a video on YouTube that had these kids in Canada I believe. They have 2000 bottles turning amethyst. To make them more purple they layed all the bottles on the top of the mountain(must be their property). They are laying on grass and with the sun I think they are going to start a fire. Someone already commented on it but, I never seen anything like it. I don't know what people are thinking, like this was a good idea? Crazy!Bottles that have been subjected to nuclear radiation, such as from a nuclear power plant will turn really dark. Also different types of glass will turn to some very odd colors. We had a nuclear plant near us and some of the employees must have been bottle collectors, because there were some really strange shades of common bottles around. Most naturally turned bottles are not that dark and not evenly turned.