Don't ever try this. I ruined a nice shot on my rare supply of 4x5 HIE with it; I didn't have any ID-11 so I just scaled up the time for Ilfosol-S by the same amount as I would ID-11 relative to FP4+. It's apparently not compatible, or at least I should have done some testing and worked out a development technique before tossing a good negative into it. I did find a thread somewhere saying it worked at 1+9 dilution for 8 minutes development at 20C (and just as many saying it "probably wouldn't work"); I tried 9 mins at 20C. This is the first time development has outright failed for me. The whole negative is a middle density of gray with just the faintest amount of detail visible. Muddy yuck. No exposure issues here, I'm sure. I used the same shooting technique I always do with this film, which has gotten me great results.