Found the same thing on one of the four packs of attys I got on sale from Vaporbank ...
A thick green residue that stained the coil chambers and saturated the wicks. I'm guessing its possibly a lubricant or release agent from the machinery used for assembly ?
Not worried about the wicks, as I always replace them immediately with stainless steel. But the coils require a thorough scrubbing after soaking in alcohol, and the gold plate on the bottom contact is eroded ...
They are useable, and seem to vape OK, but its disappointing that these attys were packaged and sold in this condition ...
Yeah, I was disappointed too, but they were what? 0.39 or 0.60 ea? Still a good deal.