I've been thinking about glass--glassblowers in particular who are just about the coolest, hot people on earth. (I'll save my arguments here...)

Anyway, I'm wondering about what makes the red glass red--I think it's gold; and what makes the cobalt blue glass blue--have no idea; and then there's that green glass--is that just plain ol' sand, ash, and the other third thing I can never remember that causes natural green glass? And how about clear glass? What is it called?

If anyone knows what these colors of glass are properly called, I sure would be appreciative of your posting that info here. And if you know what makes 'em what they are in the blowing, even better! And, if you've never personally seen a glassblower at his/her work, well, you just ain't lived yet!

From the other side of the looking glass,
WindWrought A vessel produced by a glassblower's oh-so-skillful mouth