Begin with dry brushing, mild soap, and oxalic acid for iron stains, reserving sanding for localized leveling. For stone, use poultices and steam rather than aggressive acids. The goal is clarity, not gloss, preserving tool marks that telegraph the material’s authentic journey and enduring spirit.
Use scarfs, splines, and butterfly keys to stabilize checks without dominating the surface. Where metal is necessary, choose mechanically fastened plates and screws that can be removed later. Dry-fit meticulously, then glue only where movement patterns allow, honoring wood’s seasonal breathing, resilience, and natural intelligence.