@confusedcharlot @wxcafe@social.wxcafe.net uranium?
@confusedcharlot @wxcafe@social.wxcafe.net ah, there's also leaded glass, so maybe that
@confusedcharlot @wxcafe@social.wxcafe.net lead crystal has higher refractive properties than regular glass so I bet it's great in cameras https://en.wikipedia.org/wiki/Lead_glass
@noiob @wxcafe@social.wxcafe.net it could be lanthanum too. it's more abundant than lead