Do glass welding lenses have a coating or film on them? Or is the 'darkness' built into the glass? I'm wondering if both sides of the lens is scratch resistant like glass,
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Honeywell Pipeliner™ 110 White Fiberglass Fixed Front Welding Helmet With 2" X 4 1/4" Shade 10 Lens - OE Meyer Co. | Industrial-Supplies-Welding -Gases-Propane