Author: hedleywakefield_h1syxw

UV Treatment for Thorium Yellowed Lenses

In the past, in the era where the lenses we now call vintage, were in fact new; an oxide was added to the lens element in the manufacturing process. This was Thorium oxide, and when used as part of the glass manufacturing process it improves the lenses refractive index and decreases dispersion. Thorium dioxide is […]