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ghost crystal problem



In preparation for a demonstration about the index of refraction, I
placed several "ghost crystals" in distilled water as per the directions
included with the crystals. They have expanded greatly in size and are
clear, just as expected.

The problem is that there are tiny air bubbles trapped in the crystals,
so they are not completely invisible.

Has anyone else had this problem in preparing them? Any insight will be
greatly appreciated.