Trask: My home-made 'Microphen' on some other Forum is said to be the Ilford 'Autophen' Formula for machine processing but I'm not sure. I find I have to cut the times compared with Ilford data on Microphen 1+1
Sodium Tripolyphosphate 3.4 grams
Sodium Sulphite anhyd 100.00 gms
Sodium Metabisulphite 0.65 gms
Hydroquinone 5.00 gms
Phenidone 0.2 gm
Boric Acid 2.7 gms
Borax 6.8 gms
Potassium Bromide 1.0 gm
Warm Water to 1 litre
I use filtered water or you can use distilled water then the water softener Sodium Tripolyphosphate is not needed ( I don't have any)
I use 9 mins for Ilford Delta dated 2004 1+1 dilution -- i have also used it 1+3 for 2007 dated Fuji ACROS 100 for 11.5 mins