Hi Celeste,You can use it up
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September 6, 2008 at 1:14 am #10696
You can use it up or down — but some irid deteriorates if fired down twice or more. I like the look of irid fired down – the irid textures nicely.
Face, capped with clear – they all work fine. Iridized glass is pretty tough stuff.
As for firing, when I have irid in a piece I fire much more conservatively. I believe the thin, metalic coating can really mess with even heating.
Helios Kiln Glass Studio