What is under a "repatinated" surface?

What is under the surface of a repatinated coin? I took these coins and found out, documenting the process.






Take a look at the surfaces on my page:

http://augustuscoins.com/ed/numis/surfaces2.html

This page is a followup to my page on altered surfaces:

http://augustuscoins.com/ed/numis/surfaces.html

The repatinated surface makes the coins easier to see. But, they look altered. Is repatination like this a good idea? Or, are the coins "better" after the applied surface has been removed? What do you think?

 

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Repeat

 

Definitely after. Those shoes go well also.