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BS EN ISO...
BS EN ISO 13297:2018 Small craft ....
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BS ISO...
BS ISO 13926-1:2018 Pen systems ...
1.1 ,Test Method D2616 describes a painted gray scale and the procedure to be used in the visual evaluation of color differences on non-self-luminous materials by comparison to this scale. This practice provides an alternative method of obtaining a similarly valued result by an instrumental method.