Fiebings Dye 4 oz USMC Black
2100-01 Permanent spirit-based dye for all your tooling leather projects. Apply with #3445 Wool Daubers or sponge. Finish with #22002 Super Shene. It is ORM-D and must be shipped by ground.
Tip: When dyeing, use a piece of terry cloth rag that is well soaked. Use Deglazer on vegetable tanned (don't use Chrome tanned leather on knife sheaths, it will leave black corrosion marks on your knives) leather to allow the dye to take more evenly. I also spritz the leather with water so it is uniformly slightly damp. This helps keep the streaks down.