Quoted from PinMonk:Ruh Roh. I TOTALLY recognize the crackling ink on the plastics. They used incompatible inks on the PETG when they screened them, and the ink is now crackling because it didn't "take" to the PET-G plastic. The ENTIRE first run of Shadow Superset plastics I did way back when in 2004-ish had to be recalled, re-run, and replaced (at my expense) for this exact reason. They all started crackling and you could only really see it when they were backlit. It looked EXACTLY like what you have in the picture of the plastics. It will not get better over time, only worse.
I remember that! I thought it was an excellent way to handle that situation, hats off to you Still have my Shadow, too.