Hive mind here's a weird problem. If I measure the resistance across what I believe is a carbon steel ball bearing, that I've scrubbed with steel wool and then washed with acetone, the resistance between the probe points is a rapidly fluctuating number between 30 and 800 ohms. If I do the same thing with a carbon steel file it's steady at about 0.5 ohms. Any guesses about why a ball bearing acts like this?