substancePaint ProofColors & materialsA named craft material / finish lemma (Paint Proof) drawn as an exact public-domain workshop phrase.Paint Proof is historically related to Ochre.carriage-painting seats orphan paint-proof beside ochre as a first craft peer — object speech, not a text-container or tradition dump.from M. C. Hillick · Practical Carriage and Wagon Painting, PD Gutenberg #48173historically related to · sourced · documentedsourcesPractical Carriage and Wagon Painting · M. C. HillickM. C. Hillick, Practical Carriage and Wagon Painting (PD Gutenberg ed.).