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The test consists in drawing dynamically of one or more lines on the test area using the Tester with a total area of at least 6 cm2. If the marker line creates an uninterrupted film that lasts for at least 2 seconds, it indicates that the wettability of the surface corresponds to the value of the Tester (e.g. 42 mN/m) and the required level of purity has been reached.