Here's an idea.....

If you want to preserve the hide on the cheap....you could rinse the borax off the hide real well....and after drip drying for about 30 minutes, pour vinegar on the flesh side and let it sit for a few hours to bring the pH back to close to where it should be....THEN rinse well in several washes of clean cool water.
Then go to the local ag store (Atwoods, local coop, Souther Agriculture, etc.) or gardening deptment of a local store, and buy some aluminum sulfate (about $5.00), mix about 3 lbs into about 5 gallons of water, mix in 3 pounds of salt, and immerse the hide in the solution for about a week, stirring 2-3 times per day. Oh, yeah, use a plastic container...not metal.
Remove the hide and rinse in 5 gallons of clean water with a teaspoon of baking soda to relax and neutralize the skin a bit. Then rinse in a couple washes of cool water, and hang on the clothesline for about 3-4 hours to drip dry a bit.
If you have some sort of leather oil, rub it into the flesh side of the hide. You might be able to get by with mink oil......if that's all you have.
As the hide dries over the next day or two or three, strech and pull and toss the hide around a lot to soften it as it dries.
Kind of a primitive and outdated method, but you can produce a nice soft "tanned" (actually "alum-tanned") hide this way.
The real key is in the pulling and stretching of the hide....a "staking" method also works great over a broom handle or old wooden baseball bat.
Hope this helps and good luck!
