> I have no idea if any of these new preservatives are harmless or toxic

Well, pentachlorophenol popped right out when I looked at the list. It is not new and it is very toxic. It is usually called "Penta". This is from 1981:

> Pentachlorophenol (PCP) was introduced in the 1930's as a preservative for timber and lumber. AlthoughPCP, itself is among the more toxic chemicals available to the public, the technical product contains neutral impurities which could prove to be more hazardous. For these reasons, PCP is closely regulated in several nations, and the US Environmental Protection Agency took action in 1978 to limit registered uses in the United States.

> PCP is acutely toxic to all forms of life. Moreover, the technical product can contain up to several percent of neutral impurities which include the toxic chlorinated dibenzodioxins, dibenzofurans, hexachlorobenzene, and cyclohexadienones responsible for the observed chronic symptoms; the reported levels vary with the date, route, and source of manufacture and the method of analysis.

> The disposal of treated wood and other PCP—containing products raises another problem. PCP is poorly combusted at low temperatures (207), so that attempts to burn treated wood results in volatilization of the PCP and conversion to dioxins

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