Scota4570, I hear you. This is Marc's opinion, and I am not trying to step on anyone's toes. Why use vinegaroon? Why not black Fiebing's Pro Dye? I am guessing just so a maker can say, "I used vinegaroon, the old traditional dye." The cost saving cannot be much considering a bottle of dye is $5.00.
It seems every so often the same situation comes up. "My leather and stitching are rotting after a couple of years. What happened?" Each time a constant is that vinegaroon was used.
There are the usual helpful questions about "Did you let the solution use up all of the acid in the vinegar? Did you neutralize it with baking soda the right amount but not too much?"
I want something repeatable, and straightforward. Knowing all about the vinegar solution and correct neutralizing seems to be an ancient art, but I don't see the answers shared. I am sure some of you experienced makers use vinegaroon successfully, and more power to you. As my Australian friend would say, "Good on you!" :-)
In this longrifle hobby the ancient stain of nitric acid is used on maple because it gives a look like no other, and doesn't fade. It is still the best. The look of vinegaroon however is nothing unique. Just a black that looks charcoal blue-ish until oiled.
"Shoes, and leather tack for horses, and oxen, were traditionally dyed with vinegaroon." A serious question Hungry Horse - Is vinegaroon still used by saddle and harness makers today? I don't know. I am honestly asking. I personally think that the reason many original bags did not survive (compared to guns and horns) is vinegaroon dye.
Scota4570, I saw your comment about a respected retailer. If that retailer's name starts with "T", you most likely got overseas leather. I bought two hides from them that were horrible. They would not take or hold dye or finish. Almost like they were tanned in silicone. I discovered that most of their hides were from South America. Try Wickett & Craig for leather. USA tanned in the NE. Great products. Not inexpensive, but as you discovered, the time and effort are the biggest part of a project. Nothing demoralizing like doing great work and then the project is sabotaged.
No disrespect to anyone intended by my post. If you can make vinegaroon work and last, you have my admiration.
God Bless and best wishes, Marc