Okay, just fooling around. I tried tea. two bags in a quart pot with an inch of water- boiled 15 minutes. For some odd reason 8-10 pepper corns (whole) seem to improve things. Let the tea cool- hot water will shrivel up the leather.
1. Soak leather- comes out "fawn" Let dry about a day and put a very light coat of neat's foot oil on it. Then put out in the Sun for half to a full day. Comes out a little darker.
2. Repeat everything, now a little darker.
3. I've needed a third effort and this time a lot more Neat's foot oil- the end product is sort of like Latigo leather and about the same color. I wish I could post photos but mid to slightly darker than mid-brown. I didn't think I could get that dark a color from tea. I soaked the leather and rubbed it on a white rag. It didn't bleed out and color the rag- seems like a "fast" color.
If anyone is interested, don't try on a project- just test with some scrap leather. The Sun treatment is definitely required
I did two projects, one with the leather pieces before being sewn together and another -a small bag- after sewn together. Both work but treating before sewing together is best. The tea is cheap, a couple of pennies but be prepared to use some Neat's foot oil. You need to soak the leather. This softens the leather SO it won't be appropriate for all purposes AND I am just starting on this, no test of time. I'll see if the color stays the same. Nice even result, no streaks or blotches.
This Color: