Response to Ilford DD-X vs Ilfosol S

Just out of interest, I had a look at the MSDS sheet for Ilfotec DDX. It appears to be a fairly straightforward buffered borax P-Q developer, similar to D-76b. It's a liquid concentrate spinoff from Ilford's earlier ID-68, no doubt.
The negatives I've had from Ilfosol-S, ID-68, and D-76 are superficially quite similar in gradation, but Ilfosol gives a slightly sharper image, and handles highlight separation better, especially with T-max and Delta films.

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