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
Andrew Jonathan Fine.