Thanks for those suggestions, Ed.  But I’m a bit confused with “try it over

opalescent with a glue or sandblast resist over the irid”.  Are you suggesting

placing irid side down against the opal, after having first made a design on the irid

with glue..or sandblast resist (like Contact paper)?  I don’t see how the plastic

would fuse…so at the risk of sounding dumb…I’m not getting it :)  Or perhaps you

mean to first sandblast a design in the irid (which works well and is very easy to do)

 but then I don’t see how the opal comes in?  Thanks for any light you might be able

 to offer…

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