This is interesting. I'd used Rodinal in the past, but stuck with HC 110. Then a couple years ago switched to Rodinal. I've done a lot of zone testing at 1:50 and 1:100 for contraction and expansion. But I never thought about doing a straight up dilution test. I'll have to test it out with Tri-X and see what I think. Mainly, I'd be interested to see where it gets grainier. Since that's the way, uh-huh, uh-huh, I like it.