Tom, things have a tendency to be complicated when several pieces are on the board or perhaps I'm not clear enough. Jamie's GAB has no zinc bubbles for sure, but my comment was made in reference to the IAB you posted i.e. imperfections in relief.
This is still a learning process for me, so please excause some silly remarks. I'm very familiar with the process of tarnish when it comes to pieces made in silver i.g. an OL. No matter if silver- or gold colour is added on a genuine silver piece, the dark tarnish from oxidation will eventually force its way through the surface.
From looking at the database I understand the type discussed here is in zinc, although it doesnt feature a catch-plate, which is generally associated with zink. Consequently my question is: does zinc tarnish in a same way as a silver piece. After all, when distinguish a zinc piece, the darker spots are generally used as a confirmation of the metal, created by worn off silver paint.
The enclosed image illustrates yet another type of tarnish. The left PAB is made in Tombac and is heavily tarnished on the reverse. Still the remaing silver colour is rather intact, not speckled as the other PAB. Well, unless a 2nd dark coating was applied, at least we know Tombac will tarnish as well. Sorry for the rambling.
cheers
Peter
This is still a learning process for me, so please excause some silly remarks. I'm very familiar with the process of tarnish when it comes to pieces made in silver i.g. an OL. No matter if silver- or gold colour is added on a genuine silver piece, the dark tarnish from oxidation will eventually force its way through the surface.
From looking at the database I understand the type discussed here is in zinc, although it doesnt feature a catch-plate, which is generally associated with zink. Consequently my question is: does zinc tarnish in a same way as a silver piece. After all, when distinguish a zinc piece, the darker spots are generally used as a confirmation of the metal, created by worn off silver paint.
The enclosed image illustrates yet another type of tarnish. The left PAB is made in Tombac and is heavily tarnished on the reverse. Still the remaing silver colour is rather intact, not speckled as the other PAB. Well, unless a 2nd dark coating was applied, at least we know Tombac will tarnish as well. Sorry for the rambling.
cheers
Peter
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