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It's varnish. It was quite a bit paler with just the ground.

Number three on the way.

What grounds have you tried that did not work out well or you did not like and why?

Time for me to figure out how to carve a bridge...

Oh, I like that. Going to remember that one.

Metropolitan Music.

The one on the right has some madder lake mixed in with the ground.

And an arcade.

Progress. Still need to shape the buttons...

I'm not sure if this has been posted here before, but this is excellent. ANCIENT BINDING MEDIA, VARNISHES AND ADHESIVES https://www.iccrom.org/sites/default/files/2018-02/1995_masschelein_ancient_61234_light.pdf

Just books/internet; mostly Johnson and Courtnall, but I have the Strobel book, as well. That and lots and lots of reading through old posts here on Maestronet, some from Roger Hargrave's site, Davide Sora's amazing videos, etc, etc.

Well it's definitely NOT the usual, this time... Saved for posterity.

Very nice.