The traditional oil to use is castor oil, try just a couple of drops and let it absorb before stirring as described above using bone or plastic spatula. The reason not to use metal is if the paste is made with genuine cinnabar (sulphide of mercury) it will dissolve a little of the other metal in time, cheaper pastes, such as those that come in tins, are now made with synthetic pigment. #SealPaste
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