What Chemical Causes Wood to Change Color in Sunlight?

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TalonD
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Just wondering if anyone might have a guess as to what chemical this could be based on it's apperance when it is applied to wood. I found this picture on a woodworking site. This is some kind of chemical stain for wood. When first applied to wood it is a lemon yellow color but after a few minutes of UV exposure in sunlight it turns a brown / tan color.
 
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no opinions eh? I'm thinking possibly ferric chloride or that in a mix of other things