Source: http://www.film-and-darkroom-user.or...ead.php?t=6548.Hyfin was Ilford's high definition developer. In my ancient formula notebook (created by copying down formula's given to me by much older photographers when I was a wee lad in a camera club) I have a formula given to me by the Vice President who did/had worked at Ilford:
- Metol 0.5g
- Sodium Sulphite (anhyd) 5g
- Sodium Carbonate (anhyd) 5g
- Water to 1 litre.
Development times 15-25 minutes. Requires a minimum of 600ml of chemistry per 35mm or 120 film. This formula is very similar to Crawley's FX1 developer with the omission of the Potassium iodide.
I have no idea of the validity of this formula or any way of checking it, though.
See also this old thread: http://www.apug.org/forums/forum223/...-develper.html