My wife used to do glass painting. You got tubes of glass relief which you draw into the glass. It hardens into grey / black lines and looks like stained glass lead. You then paint inside the relief with the glass paint. It’s quite beautiful once it’s done and finished
Netherlands - we have some of the cleanest tap water here. You can drink water from any tap. Ironically bottled water from the shops is a big seller here and you see people with liters of the stuff in shopping trolleys and I’ve never been able to figure out why anyone would spend money on something that we have an abundance of in our houses
We had a mirror painted which caught the sun for years (through a front door) and some glasses on a window edge. Both seemed to be fine.