The labels were fairly well applied: all present and correct with about 99% perfectly centred though they are not aligned with the edge spots. Stacks of 50 were all within a 1/4 chip thickness of each other and the size and weight felt consistent. In short, it’s probably not worth cleaning or oiling them as after a few days of use you won’t be able to tell the difference anyway. After a couple of days of use however, the oiled and unoiled chips were indistinguishable. I tried applying oil to a few which did enhance their colour further but they got a plasticy sheen to them.
After use, or after cleaning, the residue goes and they feel somewhat less like “earth clay” but look more intense in colour. They came with a very light manufacturing residue which gave them a chalky, clay like feel. First of all: I like these chips and think they are good value for money I bought some, then purchased a second batch (totaling 500).