Yes and no. Not all devitrification is the same. Many times it happens when glass is bent with a cold surface and warm inner. This will cause devint to happen. Another cause can be overworked glass. This is just what it is and can not be less worked for many techniques. To fix this one …
No, only the green UV glass has uranium.
It is all a little differnt based on the sand used, and yes that comes from the region. It also depends on the ratios of additions that will also effect the end product.
Here you can learn a lot about glass. Murrine Milli
This is done by putting in a lot of lines on a big tube, then pulling it down smaller, then it seems to have even more lines.
Only US 33 makes raw borosilicate glass, and it is not good. Elev8 Premier uses Shott glass, made in Germany by the people who invented boro.
Colors are made by adding oxides and other minerals. Putting in a new element oxid can make a new color. Or they can mix colors, or other oxides and minerals all they want to make a new color.
Gold and Silver work the best for fuming. Some have used platinum and copper, but copper can be a little dangerous.
Yes, this is possible. It is like a sock flip
Not saying it does not exist, but we do not know of it. Tempered glass would NOT hold up to heat and cold transitions, so it would not make a good smoking pipe. Tempered glass is designed to break into small glass parts that are harder to cut you.