The image you posted...May 18 2010 at 6:05 PM
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Response to Illusion II
well shows how the dials of these Illusion watches would appear if the cyrstal is clear plastic. The background is silvery due to the aluminum coating behind the LCD window. Obviously then, the various colored dials seen on these watches are due to tinting of the crystal itself. Of course, the problem with a silvery background is that it can pose a glare problem when trying to read the time outside in bright sunlight. I guess tinting the crystal helps in such a situation.
I'm still trying to think of an electrically conductive material that is white in color...not an easy problem to solve since most white materials are organic compounds and electrical insulators!