In article ,
"R.W. Behan" wrote:

If you use Spot Tone, try a bit of Photo Flo in the solution.

But there's something far superior to Spot Tone, in my experience. A set of
10 pens, called SpotPen, are much easier to use. They're pens with very
fine felt tips, and loaded with dye (similar to Spot Tone) of varying
densities, from nearly-white to nearly-black. First you choose the pen with
the shade of gray that matches the background of your white spots, and then
you use them just like the sable brush--adding dots of dye until the spot
disappears.

Neat, quick, simple, effective--even on RC papers.
Good luck.
Dick Behan

Do you know if they are said to be archival? That is are they guaranteed
not to discolor within xxx number of years ? Some markers use solvent to
transport the dye and over a fairly short time could become an issue.
Granted anytime you use a dye on a print discoloring can become an issue
but solvent could foment it.

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