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Ramsaye
@mespilus
Nearly all treated timber more than 5 years old will have been preserved with the 'tanalising process'. This involved loading timber into a pressure vessel, which pulled a partial vacuum, into which was injected the tanalising liquid which then entered deeper into the timber than any solvented surface treatment.
The active ingredient in the tanalising liquid was copper chrome arsenate.
Any of those three can kill you.
No treated timber should be burnt, ever.
Your local authority should have a separate collection point for treated timber, at your local main recycling centre.