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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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Welder Glasses, Solar Auto Darkening Welding Goggles Safety Protective Welder Mask Helmet with Adjustable Shade Eye Protection PC Anti-glare Glasses for Welder or DIYer Black - - Amazon.com
Glass from Welding Mask - Materials - Materials Library - Institute of Making