I use Ilfosol 3 all the time but I never developed Silberra S25.
I see from the Silberra S25 page it suggests 8:00 mins in Perceptol stock @ 20C
That is fairly close to Ilford Pan F plus time. So that would suggest around 4:30 mins in Ilfosol 1+14 @ 20C.
Photrio.com contains affiliate links to products. We may receive a commission for purchases made through these links. To read our full affiliate disclosure statement please click Here.