"TrailRat" wrote in message
oups.com...
Now I've heard some strange rumours about brass, copper and various
reactions to other material. Is it OK to use these three together
(Brass, copper and cherry) without causing discolouration? And if it is
OK what's the best way to protect both the wood and metal after the
lids return from the engravers.

I think you should look up the phrase, "galvanic corrosion" on Google. I
could be wrong, but I think this is the problem you're worried about...

Regards,

Robin