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					Originally Posted by Klrdds  Many issues can be the cause ,but  I believe in your case the case is still too exposed to light , temperature and humidity no matter what its UV rating is. Also the balls themselves can be a problem especially how they were handled prior to signing . I agree with Mike , in that the type of pen is important .I always get baseballs  signed in Medium blue ink from new Bic pens for current players , and I've used them for over 30 years with no problems. But I also believe that Selig and Post -Selig baseballs have a slightly different finish on them as well.
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 Do you think it's light from the window...even with the blinds closed?