The only premium shade I did not send to the PF was the Intense OB. It not only has a lightened pen cancel, but also a nasty thin and a crease or tear at the top. It is from an Amonette color chart. I bet it was treated with peroxide before I got it and suspect that's what lightened the cancel. I also treated it with peroxide and it did not seem to alter the cancel, but it did make a drastic change in color.
It is a shame this stamp has issues - it is a very pretty color.
I am reconsidering sending it in.