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Re: [SHADEGARDENS] Hypertufa: Reply

pt 2 of typertufa

Vinegar is a weak enough acid to pickle the concrete.  In the old days we used
muriatic acid, but this is dangerous stuff.  Now when were doing it, the
neighborhood smells like a fresh vinagrette.  If you have any of the real old
Peters fert, back when it stained, you can use this as a coloring agent. mix
with watr, and spray on.  Repeat, as the color lightens when it drie
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