Slumping glass is a highly technical operation that is subject to many variations, both controlled and uncontrolled. When an item is being slumped in a kiln, the mold over which it is being formed (which can be made of either ceramic, sand or metal) must be coated with a release agent that will stop the molten glass from sticking to the mold. Such release agents, a typical one being boron nitride, give off toxic fumes when they are first heated and must be used in a ventilated area. The glass is cut to the shape of the mold (but slightly larger to allow for shrinkage) and placed on top of it, before the kiln is heated.
What is the best butane to use in my Blazer torch?
This really comes down to what you like best. We find Calibri is one of the best. We also find that butane is butane and use what you like.
Does having an opal encased in a terp pearl compromise the integrity of the glass? Will full glass pearls last longer?
A Gilson terp pearl or a Gilson encased terp pearl will both last about the same time. We feel an encased opal may last longer as the opal never gets any oil in it. But we also feel that the opal is compatible with glass, so it will not absorb oils. Really you can get what you like. We have a few standard terp pearls not encased here.
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What are some names of the pastel boro glass colors?
Boro sticks makes some really good pastel colors as well as some other new companies. We find pastel colors are still new to the game and a bit shocky.
As of now soft glass has many more pastel colors.
What is the most notoriously hard borosilicate color to work with?
The more minerals the harder it is to work. So jet black could be that. But then there are also colors like cadmium based that too much heat will cause to boil. Cadmiums we feel are the hardest to work as they take the most time. No color is really harder to work than another, other than the time it takes.
Adding dichor or opal can also make the color harder to work per say. It does not really make it harder to work either, but if you work it too hot, the dichro or opal will burn out.
Are there any different types of glass that are compatible or mixable? (i.e. can you put a layer of clear borosilicate over soft glass? etc?)
The simple answer is no.
What a person can do is slowly move up the chain of compatibility. While 33 and 34 are not comparable fully, they will work, then you can do 34 to 35 and move all the way up to 104.
This would only make a rod of different glass, and not worth anything other than a science experiment.