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Renwax is an English product. It has to come from there someway. A small can will do TONS of things, so cost should not be a consideration, except as-exorbitant.

I also use it on the blades of...

Yes, I avoid enclosed containers with dessicant for ivory. In fact, I store no razors in anything completely airtight.
Keep all your celluloid away from any others and make certain there is air...