I would (and do) retouch which I believe you mean spotting the prints after toning and washing/drying. That way you can match the hue of the dye used to that of the finished print. It's best to have a piece of the same paper which has been processed to adjust the spotting dye to match the color you want to apply before actually applying it to the print. Go slow, use a high quality brush and do very small spots at a time.
Retouch after toning. Not only because of the hue change due to the toning but most importantly because the retouching dyes dissolve in water. After toning and washing, your touch-ups will have disappeared.
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