slagglass

Building a community for fellow slag and cullet glass collectors by sharing photos, info, and insight. Slag glass is a type of pressed glass with opaque, colored streaks that was produced in American glass factories from the 1650s to the 1900s. It's also known as malachite glass, marble glass, and mosaic glass. Glass cullet is crushed glass that comes from waste glass, such as broken glass or glass that was rejected during the manufacturing process.