Ok, Erythrosine can be added after pptn. to AgCl emulsions. If added to AgBr or AgBrI emulsions, the full effect is only seen if it is added before pptn. If added after the potn. is complete, then you get 1/2 or less of the full effect.
This is shown in Mees along with comparisons with other dyes.
Is this the case with the Sands' dyes (can't recall the exact #'s at the moment) or is it specific to Erythrosine? i.e. if I wanted to add a bit of green sensitizer (Sands) to a AgCl emulsion.