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Ballard Reuse - Ever wonder how some glass doorknobs turn purple? Before 1915, manganese dioxide was used to decolorize the greenish tint of glass caused by iron. It oxidizes the iron and
Purple Smooth Glass Door Knob | British Ironmongery
Electronics, Cars, Fashion, Collectibles & More | eBay | Door knobs, Glass door knobs, Door knobs and knockers
Purple Frosted Smooth Glass Door Knob | British Ironmongery