Rich - that is one HANDSOME horn! I love your philosophy of the making of it. It's simplistic yet very personal to the "person" who constructed it. I also love the chip carving on the plug!
I had a number of original horns in my collection at one time - nothing real fancy but a few "common" horns from the early 1800s through probably the late 1800s. Someone mentioned "green" - I had one that was very "green" in color - and it appeared that it was dyed.
I've made a number of horns over the years but the last few I constructed were more "traditional". No machine tools - scraping the horn and working it with hand tools - pretty much what would have been available for the time period. On several I used "Old Bones" that gave it the "aged" look. They turned out good but then I got to questioning whether I wanted them to look 200 years old or, if I was wanting them to possibly look ten years old - the way they would have looked if the year was 1820 and the horn was made in 1810 (as an example). I think that that is something we all struggle with and like anything else, it ends up being a "personal preference". I don't do a lot of "primitive" or re-enacting anymore but I've always had a preference for "plain" things - as an example, say a Bean rifle over a finely inlaid Kentucky. I'vd done a lot of leatherwork as far as hunting pouches, holsters, etc. but I even found myself "drifting" away from leather hunting pouches to ones made out of old, ratty canvas or pillow-ticking, etc. - something that "Ma" might have stitched up for me to use as a "possibless bag" out of material that was available. Might sound weird but I have to believe that a lot of "poor boy" pouches were made like that but because of the materials, not many survived. I even experimented with making some and coating them with various things - tar based materials, etc. much like some of the early haversacks were made. I finally ended up using black latex paint on pillow-ticking and then tumbling it in a dryer after the paint dried to give it a "worn" look.
I've rambled on enough but I'd love to hear more from others on what you use to dye horns, your thoughts on making them look "aged", etc. Many thanks!