Ilford Bromophen formula ?

[Stocky]

Originally Posted by Dave

Phenidone and Dimezone-S have slightly different molecular structures, but I have no idea if it is sufficient to make a difference. Check them here.

There have been at least 4 commercial versions of phenidone:

Phenidone A, phenidone B, dimezone, dimezone-S.

They are all photographically phenidone. Dimezone-S has the advantages i mentioned above.

I have read confusing opinions about whether they are equivalent weight for weight. Dimezone-S is a slightly heavier molecule (206 instead of 162) so i think a reasonable substitution is to use 1.27g of dimezone-S instead of 1g of phenidone. This is just a guess on my part. Some writers over at pure-silver think a little more is needed. I doubt that it's critical.