Abstract
Previous international round-trials concerned with yield-testing by the IWTO Test Method IWTO–19–68/71 appear to indicate that the major source of between- and within-laboratories variability is in that part of the method concerned with determination of vegetable-matter content by the so-called ‘chemical technique’. These previous trials were conducted by using core samples taken from bales of greasy wool, sometimes blended and divided into sub-samples by the C.S.I.R.O. Division of Textile Physics and sometimes blended and divided by the participating laboratories. The testing therefore involved processes other than the chemical test for vegetable-matter content, and these other processes may thus have contributed to the variability. This paper presents the results of a round-trial in which artificial samples were used and which was confined to the chemical test for vegetable-matter content as described in the IWTO Test Method IWTO–19–68/71. Appreciable variability was found both between and within laboratories, even for this simplified trial.
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