Creasing – If your artwork is very dark and particularly for black artwork, you can sometimes experience a “cracking” effect along the spine or folded edges of the card where the dark ink at the fold cracks away from the card and you see white card exposed beneath it along the crease.
You need to run a test print and try carefully creasing the spine if you’re doing your own printing, to check whether your material will suffer from this effect. If you’re using a professional printing company ask to see samples of dark coloured, folded card packaging to check the creasing process used by your printer won’t cause this effect.
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