Response to Compensating developers and accutance developers

I hear this often, that phenidone is less sensitive to bromide than others. I read once that in fact, the activity of a phenidone developer increased with bromide concentration up to about 1 gram/liter. Does this same rule apply to superadditive combinations of phenidone with other agents like hydroquinone, ascorbate, etc.? I seem to get restraining action in PQ print developers with KBr.

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