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No problemo amigo. Yep, you can use oil for leather & water for felt. I add 1 drop of detergent to water but you could even just dust it lightly on leather for a very subtle effect. It will get...

Just another option. The Kremer pigments CrO was very popular with the European forums a while back.
Chrome Oxide Green - Mineral Pigments - Kremer Pigments Inc.
The powder is supposedly 0.3 um...