I recently created some tickets that were professionally printed then hand folded into an origami heart shape.
We used 170 GSM paper and I'm not sure what ink the printers used.
They arrived beautiful, but once the folding began the ink started to rub off around the folded edges. Our bodge was to colour in the immediately visible edges with a colouring pen.
It was for a student event with a tiny budget, I wouldn't do that with a real client.
What ink and paper combination would be best to make sure the ink doesn't rub off in future?
Here's an example (the example was coloured in with a badly matched shade of red and was not sold, others were much better but I don't have any left):