Glassmaking is an ancient craft that has been practiced for centuries. The ingredients used to make glass vary depending on the type of glass being made, but some common ingredients include SAND, POTASH, and frit. SAND is a naturally occurring granular material composed of finely divided rock and mineral particles. POTASH is a potassium-rich compound that is used to reduce the melting point of glass. Frit is a type of glass powder that is used to add color and texture to glass. All three of these ingredients are essential for glassmaking.