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Posted By: davidcycleback

UV light can lighten wood, cloth and paper, but it's not as a big an issue with a bat. Even if sun lightened a bat 10 percent that may not alter the financial value. To check the effects, just look at wood items around the house, like furniture or wall panels.

Regular window glass blocks about half of UV light. Glass that is UVA and UVB protectent should prevent most.