That's not paint, it is just grease..anti-seize really.
They aren't machined washers, but I doubt there is enough difference between each stack of 3 or 4 washers to make a significant difference. However, you have peaked my curiosity. I will buy some more and randomly create some new stacks of 3 and 4 and measure them loose and clamped tightly together. I'm guessing maybe a few thousands difference between each stack; especially since they are so thin. Each washer is about 1mm thick. Besides, I've always wanted a micrometer.
If, however, I find that they vary significantly, I'll be in touch.
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