grattage noun2 •A technique popularized by Max Ernst involving scraping at dried paint in order to form patterns.These same forest images appeared when he adapted his frottage technique to the roughly rubbed and scratched painting techniques of grattage. — 2013 •The scraping away of granulations (from an ulcer etc.) in order to stimulate healing.August 18th.—Operation by "grattage" without ether. The pain experienced by the patient was quite severe. — 1891 formsgrattages
