What Chemical Causes Wood to Change Color in Sunlight?

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The discussion revolves around identifying a chemical stain for wood that initially appears lemon yellow when applied but changes to a brown or tan color after exposure to UV light. Participants are considering various possibilities, with ferric chloride suggested as a potential candidate, possibly in combination with other substances. The focus remains on the chemical properties and reactions that cause the color change upon UV exposure.
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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
 
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