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Expert's Corner — darkening

TIP: Linseed Oil Gets Darker in the Dark

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Linseed oil (both raw and boiled) darkens in the absence of light. That is, it darkens in the opposite conditions than those affecting most finishes and woods. These usually darken when exposed to light, especially high UV sunlight or fluorescent light. Take a look at the accompanying photo of two cans of linseed oil in the process of going through their darkening stages. The can on the left shows fresh overspill, the slightly yellow color you expect from linseed oil when you are using it. The can on the right has been stored in a dark cabinet for several years,...

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