Quote:
Originally Posted by tjisonline
i found a way if you are in a pinch after getting one of my cards sent back w/ the dreaded "color added" on the flip. i was given the card by a respected person of the hobby who (like me) didn't check it. oh well.
take a close-up picture of the card or use a scan. grab your fav mobile device photo editing app (or laptop app). i use photoshop express. open the images and use the "invert" filter. you will see imperfections immediately. i circles the areas on my 1971 ernie banks. on the 71s, black displays as "white" and green as "purple".
added ink will be a dark color as that doesn't invert. Stands out especially on the back edges / corners. still can't believe i didn't check before wasting money getting this graded. [emoji1751]
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Did this with the Baylor/Baker card - scans directly from SGC and using GIMP. I'm guessing the evidence is clearly seen in the upper right corner on the back - corner closest to the card #.