What is investment?
Investment is a mixture of materials used to make a mold. In general, investment mixes for kilncasting glass are composed of three basic ingredients: a binder, a refractory, and modifiers.
Some artists use readymade investment mixes like Bullseye Investment, which is plaster-silica based.
To learn about creating your own investment recipes, see TipSheet 8: Basic Lost Wax Kilncasting.
Related Questions
Can I make a reusable kilncasting mold?
Do I have to dry my casting mold in the kiln?
What molds are used for kilncasting?
Helpful Resources
TipSheet 5: Bullseye Box Casting
Video lesson: Day of the Dead Skulls