Although everything else is hand done, the crest is printed on the paper, so I chose a paper that would give me the best image I could get from my printer. It's not one I usually use for calligraphy, but a bit of testing suggested it was fine for lettering too.
So I merrily created the piece and sent it on its way.
A couple of days later the customer contacted me to say the piece was smudged. I was puzzled - perhaps as it was so small he felt the lettering was insufficiently sharp? Of course I said I'd do it again, and asked if he's be so kind as to send a photo of the smudging just to see what it was I needed to correct.
Oh my goodness - it looked terrible! On the plus side, I knew I'd not sent it out in that state, but what had happened? I knew I had wrapped the piece loosely in a protective sheet of paper before it went in the envelope, so I had a little play. Even allowing the ink (black gouache) a couple of days to dry, it didn't "set" so the movement in the post of the piece, rubbing against the protective paper, created the mess.
So there's a couple of learnings - package the piece up so it's got no opportunity to move around, and if I'm using unfamiliar paper, maybe test whether the paint ever "sets".