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Tales from the Crypt, reminiscences of a glass student
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<p>[QUOTE="Bronwen, post: 849331, member: 5833"]The Romans were already doing something like this to darken & even out the color of chalcedony, soaking in a sugar solution then subjecting it to high heat. Think, though, in this case, it is the burnt carbon that is the coloring agent, not an interaction with iron. Really interesting - thanks. <img src="styles/default/xenforo/smilies/smile.png" class="mceSmilie" alt=":)" unselectable="on" />[/QUOTE]</p><p><br /></p>
[QUOTE="Bronwen, post: 849331, member: 5833"]The Romans were already doing something like this to darken & even out the color of chalcedony, soaking in a sugar solution then subjecting it to high heat. Think, though, in this case, it is the burnt carbon that is the coloring agent, not an interaction with iron. Really interesting - thanks. :)[/QUOTE]
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