Mark had a query recently asking what opaline slate is.
The answer from the ever helpful J*D team is:
"Opaline is a surface quality achieved by sandblasting. This treatment produces a surface finish that appears to be completely matt yet slightly rough, but very pure.
The black or slate colouring that is typical of the Jaquet Droz brand is obtained by subsequent treatment in baths."
Don't you just love the thought of subjecting your precious J*D to bath treatment!
J*D Forum Moderator.