My previous experience with vinegaroon is quite limited but I have many pages of information that I got from searching the subject on this forum. I used that information to vinegaroon a belt about 2 years ago and it turned out very well.
Using that same information today I vinegarooned a 7-8 oz belt blank (which was stamped and burnished prior to vinegarooning) as a test case before I did a 'wallet-size' piece of 7-8 oz leather (which also was burnished and stamped before vinegarooning....albeit a different pattern from that on the belt blank). The veg-tanned leathers were from different cows but the vinegaroon process started out being the same for both pieces, with the wallet-piece being started right after I completed the 'final rinse' on the belt.
Both were soaked thoroughly in a strong black tea and then soaked in vinegaroon; rinsed in baking soda and then a clean water rinse.
When I removed the wallet-size piece from the vinegaroon the basketweave stamping was a uniform, dark, deep, black but I could still see 'brown' around the border stamping, so I re-soaked the wallet-piece in the black tea and then again into the vinegaroon. The trouble area MAY have gotten a little blacker but I could still see 'brown' around the border stamping. I let it rest for 30 minutes and the trouble area MAY have gotten a little blacker but I still could see 'brown' around the border stamping. I decided to proceed with the baking soda wash, rinsed it in fresh water, and when the leather was drier (but still damp) I oiled it with Neats Foot oil. When it had dried I applied a 2nd coat of NF oil.
Again, the trouble area MAY have gotten a little blacker but I can STILL see 'brown' around the border stamping.
Could it be that the D435 border stamp that I used burnished or 'sealed' the leather around it so it does not accept the vinegaroon readily?
Does anyone have any suggestions as to what I should do now that the piece has been oiled but not sealed?
Thank you for your comments and suggestions. - John