Top: developmental oil bar paint formulation with a certain ratio of: castor wax, castor oil, linseed oil and commercial red paint (oil).
Bottom: a model of ricinoleic acid found in castor oil. The lower red atom is the oxygen in the alcohol functionality; the castor wax and castor oil can interact via hydrogen bonding and can play a role in the flow of the paint off brush. The paint has been applied to bristol paper . The paper has not been treated with an acrylic gesso which would absorb some of the paint oil.
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