I have a few tubs of old tooling leather that's about 9oz. I'm brand new to leather so I'm not entirely sure if this leather is usable but my gut says yes. It's all pretty rigid and not very flexible but there is some flex. Is there a way I can oil the leather to make it more flexible? I need to split it for my projects down to about 5oz and I feel like because it's so dry, I can't split it properly. On the other hand, it could very well be that the cut of each piece is making for the rigidity as not all pieces are the same. Some are much softer and flexible. I've included a video so you can see a sample of the pieces.
https://www.youtube.com/embed/lL7M8OCRfYE