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Originally Posted by Gatorade Frost
That sounds like it would be cool, but I wouldn't personally risk the chance of making a bar code tattoo that probably won't work. I don't know too terribly much about bar codes but it seems to me like things would have to be very exact for them to be read correctly.
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Barcodes can be read pretty well, depending on the quality and type of the reader. I did a project where I made barcoded bracelets for everyone attending a conference. The reader was a wand instead of a gun and it only had trouble reading the tag when the paper the tag was on was folded a few times and the barcode itself was distorted.
One thing to consider is the contrast between your skin and the ink. If you're darker skinned, well, you'll probably have some trouble getting it read.