I had a full bag of lime, I used it to tan 1 cow skin which left me with 70% lime, I then tanned a second cow skin which left me with 40% lime. I then tried to tan a deer skin but got a red text message saying insufficient lime. I assumed that more than 40% lime was needed to tan a deer skin.

However, later I came across a full bag of lime and used it to tan the deer skin. I was left with 60% which means that 40% was required to tan it. Yet I could not tan with a used bag which had 40% content which is the required amount to tan a deer skin.