Quote Originally Posted by Rudeofus View Post

PS: If Bromide had no effect on Phenidone based developers, then please someone explain me why they put it in E6 FD. And in Crawley's FX-37. And in ID-68 aka Microphen ...

PQ developers are tolerant to much higher Bromide levels, this is because the Bromide doesn't suppress the activity of the Phenidonne but it does suppress the Metol in MQ developers.

This is particularly important where developers are replenished, Autophen a commercial PQ version of D76/ID-11 had far greater capacity and could be replenished by a topping up method rather than the bleed & top up needed with D76.ID-11.

So Bromide is more effective in a PQ developer as a restrainer without causing any speed loss hendce why it's used in the developers you mention.