I just did with chips from:
JB Paulsons - Same result
Old Paulsons from real casino - same result
ASM -same result
TR King - Same result
Blue Chip - much lighter (as would be expected, these seem very hard and this test would confirm that)
Same result = easy to draw on a piece of white paper.
I have observed that the colors on the Paulsons are the easiest to rub off on other chips of the 4 above mentioned chips.
AB