substanceFire ClayColors & materialsA named craft material / finish lemma (Fire Clay) drawn as an exact public-domain workshop phrase.Fire Clay is historically related to Clay.french-polishing seats orphan fire-clay beside clay as a first craft peer — object speech, not a text-container or tradition dump.from Richard Bitmead · French Polishing and Enamelling: A Practical Work of Instruction, PD Gutenberg #17935historically related to · sourced · documentedsourcesFrench Polishing and Enamelling: A Practical Work of Instruction · Richard BitmeadBitmead, French Polishing and Enamelling (PD Gutenberg ed.).