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I know SRD sells the oil. If you do a search on Google you'll get lots of hits. Get a small bottle as a little will last you a very long time. I got an 8oz bottle years ago and still have half left....

You'll nourish them and they will end up looking much better. They'll pop again (to some extend). It will also smooth out any tears or cracks you might see in the scales. You don't need to remove...

They are mottled horn. Soak them in some neatsfoot oil.