3 ms·

Already there, already doing that. See: http://en.wikipedia.org/wiki/Corundum http://en.wikipedia.org/wiki/Corundum http://en.wikipedia.org/wiki/Transparent_alu

by vietor 16y ago

Already there, already doing that. See: http://en.wikipedia.org/wiki/Corundum http://en.wikipedia.org/wiki/Corundum http://en.wikipedia.org/wiki/Transparent_alumina http://en.wikipedia.org/wiki/Transparent_alumina