It may be Hyfin uses Glycin as well,the details Mason gives for using the Formula here are identical to the Hyfin instructions.
Originally Posted by Alan Johnson
Mason does say other formula contain "Glycin in addition to the Metol at about the same concentration" these need Pinacryptol Yellow as well a few ml of !:2000 solution. This was the way Crawley formulaed FX-2.
I'd have to re-read Crawley's original 60/61 BJP Articles. I tried the Formula that Mason fgives in the late 70's and the Acutance was like other High Acutance developers of the time.