How would you suggest inspecting my product?
Look at the used transfer paper to identify any issues, instead of just looking at the sublimated surface. Here are some things transfer paper can reveal:
Look for blotches of ink on the transfer paper. The ink should be evenly released from the used transfer paper. Typically, you can find the issue quickly by comparing the transfer paper to the finished panel.
Look for white dots or dust spots. If any spot on the transfer paper didn’t sublimate completely, you will be able to see that spot on the transfer paper in the same location.
Look at the used transfer paper to determine the heat distribution from your press. If you notice that some parts of your paper look burnt, but others aren’t yellowed at all, you may have uneven heat in your press that can cause sublimation errors.