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Help solve a mytery: Historical cedar siding treatment

canada_deck | Posted in General Questions on

One of my neighbour’s has cedar siding from the 70s or 80s. It looks like it hasn’t aged a day. They said it was treated with a chemical that probably isn’t allowed anymore.  It does appear to have a bit of a green tinge. They didn’t know what it was called or how to spell it but said it sounded like bell-ee-den. We are in Canada. Any ideas?

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