Hi,
I’m considering possibilities for a new project, the better to learn
some new skills.
I have some pre-finished Spencer opal that I’m thinking of wanting to
incorporate, but I also know that opal must be protected by glass. a
I’m considering enameling a thin glass layer onto a recessed piece of
copper plate, then etching away the other side in ferric chloride (I
knew my ham radio experience would come in handy!), so that I could
make a clear window frame.
But how do I verify that the opal and the window are going to mate
perfectly, even after polishing?
Is there any technique anyone knows of other than using an optical
flat?
Thanks,
Andrew Jonathan Fine.
