I keep a 35gl. plastic trash can 1/2 or better filled with my dye. It's a batch I started about 5 years ago. Every year I add more hulls to it. I keep the lid on it when not in use.
Some years I take the whole nut while still green, dump them on the shop floor and crack em with the end of a 2x4. Dump the whole mess in the can and leave it.
Some years I dry the whole nut, dump them on the floor, stomp em and roll em under my boot to dehull.
As a side note. If you put about a 1' of whole nuts in a 55gl. barrel the tree rats will jump in, dehull and steel the nuts leaving the hulls.
This year I strained all the old nuts and left the sludge. I love my concreat mixer.
Now to the question part.
Dear skin don't take long. Just lay it on top of the dye and let it sink ( don't force it in) when it sinks in you can take it out and rinse in clean water. Dry it in the sun, in the winter put it on the dashboard of your truck to dry. The longer you leave it the darker it get.
Modern leather needs to be hot to floot out oils and wax. Turkey cooker. You don't have to boil it, just keep it hot for a few hours then let it cool. Every day it in this cool state it will get darker. In a month it will be almost black but, you will knock years off it's life. Finish the same as the dear hide. When it's dry it will need oiled or bees waxed to keep it from falling apart from cracking.
Cloth is much like the dear hide just hot. Wash it first and put in the hot dye while still wet. Leave it in over night to cool. Clean water and dry in the sun. The longer you leave it the darker it get.
DO NOT DRY IT THE WIFES DRYER. It will leave brown dust behind that will stick to her whites, she will be p***ed at you.
Now, if you hang leather to dry the remaining dye will migrate down giving the new shooting bag a used look (darker on the down hill edges) if you retate it while drying it will darken top and sides too. Leave it wet and let it drip. You can watch it get darker on the edges, just move it every 1/2 to 1 hour as it drys.
I save the salt and other stuff for walnut pies.
Bruce Everhart
Hows that for long winded?