I treated a dried-out old leather saddle following C&V forum advice (and using what I had on hand) with various iterations of moisture, heat, mink oil, and Glovolium.
Here it is on my commuter bike, which I'm back riding this week (yay spring!):
sorry - bad cell phone pic - in the storage closet at work, where my bike goes
The saddle is much improved. I would not call it supple - it is still quite hard - but it flexes a bit, and at least it's not dried-out anymore.
After tweaking its position over a few rides, I’m even starting to find it comfortable.
The problem is … it leaves brown stains on the seat of my pants!
So, go ahead and have your fun with the inevitable potty humor.
But, any actual suggestions?