Should you have a one-colour version of the logo?
Yes, you need the mark in black or in the ink colour, for the stamp, the etching and the photocopy. The colour file is not enough if the name disappears when the colour is removed.
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Print the mark on a black-and-white photocopy and look at it from a metre away. It can be read in colour and on the bill stamp it becomes a blot. You get the colour file and the one-colour file, both with the name readable.