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White spots can be carefully darkened using a fine paintbrush and a dye of the appropriate colour. A small amount of dye, which should be very weak, is needed. The spot will darken as dye accumulates in the gelatin layer.
Black spots on gelatin-silver prints are caused by holes in the negative's emulsion. These can be removed by careful knifing of the gelatin layer.
For spotting work, always use a magnifying glass and a good light source.
- The Art of Handpainting Photographs, p. 34, Basic Supplies: Spotting Kits, Pens and Pencils https://books.google.com/books?id=NXH6aN8bz4wC&printsec=frontcover#PPA34,M1
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