In the late 19th and early 20th centuries, before the advent of modern glass chemistry, glassmakers utilized manganese dioxide to neutralize the natural iron impurities in sand that caused an unwanted cloudy, aqua-green tint.
Vintage Clear Pressed Glass Bottle with Dry Seeds
Pair of Vintage Clear Pressed Glass Small Personal Ashtrays - ONE CHIP
Vintage Clear Pressed Glass Ashtray Trinket Dishes Set Of 2 Floral Design Heavy
Vintage Clear Pressed Glass Basketweave Double Handled Condiment Basket Caddy
Vintage Miniature Glass Basket Diamond Design Divided Clear Pressed Glass
Vintage Cut Glass Bud Vase 17cm Tall Pedestal Posy Vase Clear Pressed Glass
