[albada]

Polyols are known, in generaal, as development accelerators and are used in emulsion coating as just that along for their other property of being humectants. PE

The effect of PG on development-speed is interesting. Here are the times for D316 with TMY2:

Direct to water with No PG ......... 13 min (i.e., the formula I posted 3 postings ago)
Direct to water with PG ............. 13.75 min
PG-based concentrate ............... 12 min

So adding PG to water slows development, but when the PG is in a concentrate, it accelerates development. Weird, isn't it?

Mark Overton