2oo4 Jackson $20 bill

Found a $20 bill that looks just like a seal is stamped on the back but when I take a picture it turns blue but when I look at it regular with my eyes in a loop it's green any answers I have no idea thanks for your help

 

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Try a different camera. You see all those little yellow "20's"? They're in a pattern that some software recognizes as currency, and the software may skew the colors because of it.

 

Thanks

 

Looks like a chop mark to me.

http://www.antiquemoney.com/what-is-that-strange-mark-on-my-100-bill/

 

spender..

 

That's not the seal. Tellers stamp or other post BEP inkmark.
$20 same as in town.