Ah, yes. That makes perfect sense. Hadn't thought of it that way. It explains much really. Thanks.
OOPS I forgot to mention just in case anyone was thinking of trying the formula, it is supposed to be diluted 1-1. I generally do dilute it but on occasion I use it straight.
In my experience Ansco 47 is similar to but slightly contrastier than DK-50 or HC-110. It does nice things with softly lit white background product stuff. It falls into the commercial developer catagory with the aforementioned and D-61a and others.