Talk:Index-matching material

One cool picture to have would be a piece of glass partially submerged in paint thinner. (The indices match.) ―BenFrantzDale 03:35, 10 February 2006 (UTC)

• distinguishing gem stones with different refractive indexes - e.g. diamond from zircon
• examining unpolished stones for defects - the matching fluid removes surface reflections and scattering so internal defects become visible