Paint layers
Gina,
The conservators often take a different approach: with a scalpel, chip off a small piece of undisturbed paint to the metal, so you have a chip with all paint layers in-tact.
Mount this vertically in resin, then sand across it to expose the edge. Look at this under a microscope and the sequence of layers will be revealed in one go.
This is usually done in multiple places to ensure that the whole 'picture' can be worked out.
Just a thought....
Mike
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