I recently used Vinegaroon for a wallet, w/Tandy leather. 1 minute in dye, rinsed under warm water, 15-20 sec. in Baking Soda solution, rub & rinse again, press dried in old towel, hung overnight. It still smells like pickle juice 2 weeks later.
We Love the beautiful black color, hoping it will last a lifetime. I'm aware, from many related blogs here and there, that it's important to maintain a slightly acidic chemical balance within the leather, to ward off future biologics, etc. Never heard about strength issues. Thanks for the heads-up.
I've ruined my first belt by over-oiling, so time will tell re: this wallet.
Mayhaps someone had the curiosity to test various samples with varying degrees of "neutralizing" soak times. Sounds like a fulfilling Winter investigation project.
Wally