I found I could easily paint fingernail polish onto ivory, and remove it later with acetone. This allows you to mask out parts of an ivory surface, leaving other parts un-masked. Then you submerge the item in vinegar overnight. Rinse and soak overnight in procion dye. Next day, add salt. Next day, rinse and remove mask. Voila! A well-stained surface.
Note, if you do not prep the surface with vinegar, the dye does not adhere as well. It still adheres a bit.
I am hoping to get a nice rich black on the underbelly of the eider duck carving. The test was done on a bit of whale tooth.
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