I started using RC paper when it first came out and was blown away with depth of the blacks. The short washing times in the then bathroom darkroom with three daughters was also a big consideration . But now in my basement darkroom I find that I am not getting the tones or depth of blacks I remember .Nor can I manipulate tone or color I know that many of the VC/RC paper s are developer incorporated which is limiting . I have tried various developers and adding carbonate etc to tone down the paper But even with selenium toning the results are not good. What’s worse with the selenium while the shadows tone to a slightly purple tone the midtone whites are unaffected, creating an optical condition where the middle grays take on a greenish cast.
I guess instead of asking what RC papers are developer incorporated I should ask what RC papers are not.