More in physical privacy space than the usual post. Whenever I get mail, I shred it before disposal. Whenever I get a package, I black out the label.
But my method for blacking out the labels is basically turning on the gas range and holding the label over it until it turns black. It’s not even that good of a method, because I can still see a black-on-black print.
So, I’m wondering if anyone has any better ideas for this sort of thing.
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Most high volume printing (like shipping labels) is done with thermal printers where the heat turns chemicals on the paper black. These chemicals usually can withstand water but not alcohol so spraying with pure alcohol and wiping off usually will blank the paper entirely.