wait, so it's not a good idea to kiln strike something that contains an opal and a striking color?
hogwash, i do it all the time.
my guess is that somewhere surrounding that opal there was a bubble that wasn't "smooth". after i encase my opals and if there is any bubbles at all, i get the opal gather as hot as i dare in order to round out any bubbles.
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now i've got a Mirage
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