It was agreed in Wildhaus on 15 May 1976 that preparations for the test detailed in Document No: IRG/WP/414 should commence immediately, but that initially only two water-borne preservatives should be used - a copper/chrome/arsenic (CCA) and a copper/chrome/boron (CCB) formulation respectively. PRL, England (R Cockcroft) would be responsible for supplying only the reference species treated with the CCA preservative and Dr Wolman GmbH, Federal Republic of Germany (W O Schulz) for supplying only the reference species treated with the CCB preservative. Untreated samples of the reference species would be supplied at the same time. The two batches of treated reference species would be despatched as soon as possible to the people concerned for the 13 sites agreed. The following is the coding scheme which is being used: The first two digits indicate the participating country and person; the second two digits indicate the species of timber, and the last two digits indicate the preservative treating concentration and sample number. The CCA treated samples will be those whose last two digits are from 01 to 37 respectively, and the CCB treated samples will be those whose last two digits are from 41 to 77 respectively. eg 10 01 31 indicates that 10 = Turkey (Dr Rifat Ilhan), 01 = Alstonia scholaris (Reference species), 31 = 1st replicate of samples treated with 10% (w/w) CCA solution.

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