In tank, doing the math, you should get a starting point of 8 minutes
with 1+1 dilution for a gamma of 0.65. If you are doing reel and trough
you shorten that a little, if you're doing a rewind tank it will have to
be extended a lot.
This is assuming that you're developing it as a negative. If you're using it
as the first developer for reversal processing you likely want a higher gamma.
I will say that I don't think a highly active developer like XTOL is a
good choice for Tri-X, it will tend to compress mid-tones, but that is a
judgement call.
--scott
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