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Posted By: fkw

There are 4 types of reprints, with 3 of them easy to spot.

Colorized
Blue tint
B&W with light backgrounds (basically a B&W version of the Colorized cards)
B&W

The authentic cards are B&W and are printed in a halftone photengraving process.

David Rudd (cycleback) is the expert on printing and here is his page on the subject.
http://www.cycleback.com/baseballcards/sixteen.html