Let's see here -- 125 ml of ethylene glycol, that's just over four
ounces, diluted out against a gallon of water when the working solution
is made up.  And just under a third of a gram of phenidone, plus some
ordinary laundry ingredients in the B solution.

Sure, it'd be better to use polyethylene glycol or propylene glycol, but
I just can't get worked up over half a cup of antifreeze spread over
what I'd expect to be sixteen rolls of 35 mm or eight rolls of 120;
there's probably a shade tree mechanic in your neighborhood who dumps
3-4 gallons of 50/50 coolant (50% ethylene glycol by volume) down a
storm drain once a year or so -- go ferret him out and report him to
EPA, leave some photographer's half cup alone.

I might suggest, however, that antifreeze is less than optimal for
photography because of the other things it may contain; at the very
least, all antifreeze formulations I've looked at recently contain some
variant of fluoerescin dye (gives them that glowing yellow-green
appearance); it might or might not have some effect photographically.
In addition, some varieties (Zerex?) have stop leak added, typically a
dissolved starch that surely can't do your film any good.  Nearly all
have some sodium silicate as a corrosion inhibitor, some contain other
chemicals in the same role as well.

At the very least, if you're going to use antifreeze, either get the
Sierra brand (polyethylene glycol, far less toxic) or buy the really,
really cheap stuff that doesn't contain as many other oddball chemicals
that might make your film glow in the dark.

Sorry about the double post.  I'm still getting the hang of this.

I wanted to see how this would work before buying more antifreeze.  My next
batch will be with Sierra.  Still, like Donald says, it's a pretty small
amount and pretty diluted yada yada...

Works very well so far.

Gene

Before you get all upset, look at the warning on the side of an HC110
bottle. If you spill it on your shoes, you are supposed to burn the
shoes or launder them thoroughly. I guess tht means don't wear leather
shoes in the darkroom, or cover them with baggies.