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Originally Posted by Marcus Lim
... the actual fact is the painting is still 'growing' inside the painting.
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Originally Posted by Richard Bingham
Marcus, the principle is correct, but you have it reversed. As paint films continue to dry and give up their volatiles, they shrink They do NOT "grow".
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At the risk of an omelet on my Buick ... You are actually both right. In the beginning, the drying paint film gains weight as oxidation means absorption of oxygen molecules, then as the chemical reactions release gases, the paint looses mass.
I am not a chemist but that is the way I learned it.