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Actually, after Fitzcolorado said it seemed disrespectful I started to wonder if ancient peoples used the stone dissolving properties of uric acid to help their carving of such things in the first place....

The question in my mind is just how acidic and disolving is uric acid? I presume it depends on the type of rock.

Urine my lord ;-)
Composed not only of uric acid but also urea and various ammonia type compounds, plus whatever food/drink breakdown products the body rejects