He uses deer horn powder as sanding material, and crude lacquer on the outside. The depth of the lacquer and its ingredients affect the sound, and cannot be taken lightly.
打底是以鹿角灰、瓦灰或石膏為材料，而上漆是用生漆，打底上漆的厚薄、材料的成份都會影響琴音，一點也馬虎不得。