Day 405-aquamarine with mirrored bubbles
This wonderful clunker is similar in color to some that I have called aquamarine in previous posts. It is full of bubbles. What is most unusual with this extremely heavy water bottle is that many of the bubbles appear to be lightly mirrored. With all of the water botttles that I have seen or owned, I have never come across this before. I have to assume that more were made and are just setting out there waiting for us to discover them.
I am postulating that a silver compound was used as one of the colorants in this batch of glass (although silver compounds usually produce an orange-red or yellow batch) and that some quirk in the manufacturing process caused the silver to be purified and deposited on the inside of the bubbles, similar to the way a flat piece of glass gets mirrored with a silver backing. However it happened, it is a great and unusual water bottle and is now on my want list.