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Desert Varnish There's a Wikipedia article on it right here: https://en.wikipedia.org/wiki/Desert_varnish In a nutshell, Desert varnish (also known as rock varnish) is a dark, thin (usually 5 to ...
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Desert Varnish There's a Wikipedia article on it right here: https://en.wikipedia.org/wiki/Desert_varnish In a nutshell, Desert varnish (also known as rock varnish) is a dark, thin (usually 5 to ...