In article ,
The Natural Philosopher wrote:

Well I dunno about all that. I bought a LOT of 'pressure treated' wood
and no WAY did the greenish cast go more than 1mm into it.

Maybe a bit more at the corners. Oh it penetrates all right..its not
just a surface treatment, but the price of it alone suggests that its
not fully impregnated with copper salts. No way! It would be hugely
expensive.

Its just a way of getting treatment beyond the immediate surface, it
doesn't fully penetrate the wood by any means.



Jacksons (local to me) claim their pressure treatment is better than most.

Their website boasts about it - and clearly shows it not being through the
entire thickness (not even close).

Given they claim to be better than most I suspect most stuff is very limited
penetration.

http://www.jacksons-fencing.co.uk/pa...ons.aspx?pg=33

has a few images. No idea what particular cocktail of nasty chemicals
they use mind.

Darren