I used to do a lot of hand colouring which also involved toning steps - sepia toning, then gold toning, and toning with dye couplers. I preferred to just bleach the areas with paint brushes of varying fineness, I found I could work quickly and accurately. I gave demonstrations of the techniques back in the mid to late 1980s.
I tried special resist materials but found it much slower and less accurate. Here's a simple example:
This was
some notes on more advance colouring.
Ian