Salem

I played 1 years ago and to make leathers u had to put the tunning liquid after put the 4 limed skins, so they will become all 4 leathers.
I did yesterday the same thing, but only one became leather and the others 3 are at 99,9%. i added 10L of tunning and only one of 3 became leather.
There is a way to transform all 4 the lime skins into leathers with only 10L?

You need 1 brain per leather, in other words, 10liters of tanning fluid per leather

So they changed it....pity XD
it's not worth then make leathers for silver....

It is all about the Quantity of tanning reagent.
1 brain is 10 units.
1 boiled birch bark is 2.5 units.

Each hide requires 10 units to tan.

You can dilute the tanning reagent by putting it in a larger quantity of water, or concentrate it by adding more of it to the same quantity of water, but it doesn't change how much tanning reagent there is.

---
The same goes for the lime used to lime the hides, but it gets counted After it is used so you can actually cheat a bit to make the lime go further. It only gets (if I remember) 2 additional hides / barrel for the lime used but if you're hauling lime from a distant quarry.. it can be worth the effort.