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Cheap glasses may have iron salts in them, often yielding the familiar green color of some iron salt contaminated glasses.

Other lenses may have coloration biases which make them slightly yellowish rather than clear, or other colors dependingon the glass.But if you have a lens using early specialty glasses (wide angles, fast lenses..) from before the 1970s, you should consider checking your lens for radioactivity.Most school physics labs can do this, as can local Civil Defense offices and police or fire emergency response teams.These slightly radioactive elements such as thorium or rare earth elements such as lanthanum were used to produce desired highly refractive glasses.Other uses for rare earth elements in photography include color enhancing filters. Ross' Romancing the Rare Earths for a history of enhancing filters and the use of various rare earth elements therein.

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