[As].[Cu:2].[As:3](=[O:7])([OH:6])([OH:5])[OH:4]>>[As:3](=[O:4])([O-:7])([O-:6])[O-:5].[Cu+3:2].[As:3](=[O:4])([OH:7])([OH:6])[OH:5]The method of claims 1, 2 or 3 wherein the copper-arsenic precipitate is leached into a concentrated arsenic acid to produce copper arsenate and arsenic acid solution, so that by adding chromium acid to the copper arsenate and arsenic acid solution there is produced a wood anti-rot agent containing copper, chromium and arsenic.
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