تلميع (تشغيل المعادن) - المعرفة
الأسود = Emery Compound, a coarse abrasive material for removal of scratches, pits, paint, rust etc. Abrasive: Emery. البني = Tripoli compound used for general purpose cut and color on most soft metals. Abrasive: Rotten stone. الأبيض = Blizzard compound, used for color and final finish of harder metals, has a cutting action. Abrasive: white aluminium oxide.