MASKING LABELS – these are labels with black layer underneath. After sticking them on any print it’s impossible to see what was written or printed underneath. Additionally, they make it hard to fully remove the label and check the covered contents.
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Bar code covered up with: standard white label on the left, cover up label on the right.
Attempt to peel off the cover up label will leave a black layer on the top which is hard to remove without damaging the label underneath.