In the 1850s , they began making cased glass , which has thin layers of different colors which can be cut away to produce cameo glass .
In the 1830s Bacchus produced pressed glass by using a plunger to force molten glass into a cast - iron mold .
In the 1850s , Bacchus began making cased glass , which has thin layers of different colors which can be cut away to produce cameo glass .
In the 1830s Bacchus produced pressed glass by using a plunger to force molten glass into a cast - iron mold .