I have an original horn, circa 1800. Its got the kind of scrimshaw someone would do with a pocket knife waiting for water to boil around an open fire. Nothing fancy, for sure. The horn is well yellowed, although we can't tell if its from the age, or from some stain applied( like onion skins boiled in water. ) Bruce Horn, a member of the Society of Horners, repaired the horn for me, and examined it closely to estimate its age. We both agreed that a repair had been attempted at least once before- sometime between the 1880s and 1940s, when the mouth of the horn was glued and supported with a chrome plated ferrule- possibly from an old screwdriver! The bottom of the horn- where the base plug fits, had been cut off, cutting through some letters and a stick figure. The base plug was made of pine, or some other similar soft wood. Bruce replaced the plug, and made a new mouth end which he epoxied to the original horn, and shaped to the originals form. The Chrome ferrule is GONE. When I bought a copy of the Sibley's book on Recreating the 18th Century Powder Horn, I examined their color plates carefully, comparing some of the horns to my own. The yellow color is the same as several examples. leading me to believe its either an applied stain, or as the result of aging. Its too even in color to be the natural color of the horn.
I have seen scrimshaw work done in antlers, bone, tusks, baleen, and all manner of products from Asia, including Ivory from China. The modern stuff( sold in Hawaii to tourists) involves some very nice art work, and some of it uses colored dyes or paint to highlight the scrimshaw. I used Charcoal based ink when studying Sumi-e painting in College and I understand about " Bleeding" inks. Ugh! That is why I believe that most of the colored scrimshawed work that uses color involves the use of more stable paints, than inks, or dyes. You can rub paint over a scrimshaw surface, and fill the lines. Then you just wipe off any excess on the surface, and let the paint in the lines dry. The art is then covered with lacquer or an acrylic varnish, so that you can clean the horn with various cleaning agents without removing or softening the paint in the lines.
Again, these are " Look-at " horns, not something to be carrying in the woods. :hatsoff: