I paint similar colors, easily mistakable for each other, with different colors of nail polish on the flat end of one side. I cover the one labeled rod's label with tape, so that it is sure to survive. This way, if I want to know what a rod is, I match it to a similar colored rod with the same nail polish on the end, and see what the tagged rod of that lot is labeled.
It's not a perfect system, but it works ok and doesn't take too terribly long.
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