How can I tell if my windows frames are made of treated or untreated pine?

There are chemical reagent tests for boron, copper and tin compounds which, when sprayed on freshly cut surfaces, will tell you whether these elements are present but will not indicate what level of treatment has been achieved. This can only be done with chemical analysis (destructive) of wood samples.

In the case of the question asked, the wood had a green tinge, suggesting it is most likely to have been treated to the H3 or more recent H3.2 specification with copper-chrome-arsenic (CCA) preservative.

There are testing laboratories that can test small samples of the wood. One is operated by Scion – the former Forest Research Institute in Rotorua.

Contact Katrina Martin in the Veritec Analytical laboratory. or DDI (07) 343 5598.