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I have been looking for an answer to this question for awhile. I have a Back to the Future Part III Movie Poster with 11 signatures on it that I purchased on eBay. It is a full sized poster 27x40 and is glossy. My main concern comes with something I am not familiar with, which is that it looks like 4 of the signers used paint pen or the signatures are fake but I have no idea how to tell. I can take a pair of tweezers and scratch the signature off (only tried once) but you it does come off. The signature feels raised from the page also and you can follow the marker when they crossed over another letter. The other signatures are in blue sharpie (reflects red/purple in the light). These also don't appear to have the raised feel of the black ones (can't feel with fingernail). The rest are in silver sharpie it looks like. You can follow the signature when they crossed letters on these as well and you can see the groves in the pen.
If better pictures would help I can try to get some but I have been wondering this for awhile. Any help on a way to determine if they are actual signatures or fakes?
Thanks
Andy
