CATAS Answers

Find here the most Frequently Asked Questions.

Is it true that some paints may turn yellow in the dark as well as at the light?

Yes, it is. Some paints tend to become yellow as a result of complex chemical processes that involved directly the resins which the paints are made of or to the additives contained within them. Sometimes it is also possible to observe some apparently anomalous behaviors with regressions of the yellowing when the surfaces are exposed to the light. These are the effects due to the "lability" of some colored compounds that are formed in the absence of light and with the acceleration caused by the heat. For these reasons, CATAS suggests performing the following tests in order to assess the stability of the color of a painted surface: the light resistance according to the UNI EN 15187 and accelerated aging in the dark according to the Unichim 2195 method.

CATAS Referrals:

Claudio Caon Tel: (+39) 0432 747224 E-mail:

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