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The number of articles that are chosen based on the type, colour and alloy and the number of samples to be taken from these articles, for quality control and analysis, must be sufficient enough in order to secure the conformity and homogeneity of all parts of the whole lot of the articles.


Aiding means during sampling process for the homogeneity of the lot, is the touch stone method and the X-Ray fluorescence (XRF).

Sampling process can be done with scraping, cutting or drilling.