For four commercial products of CCB-salts the influence of the kind of sampling on the composition of test solutions has been tested. For each product several 5 g samples have been taken at random, after careful mixing the content of each bottle, and after grinding the whole content. With each sample a 5% test solution was made and analyzed on the content of chromium, copper and boron. Altogether 111 solutions were investigated. The results demonstrate, that an at random sampling gives large variations in the composition of the various test solutions and only a grinding of the whole content of a bottle to a fine powdered product ensures a constant composition of test solutions.

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