Derwent Blender & Burnisher - Derwent s Blender & Burnisher are versatile tools for subtle or intense color pencil effects. The burnisher is a hard, colorless pencil used to create a polished finish on top of existing layers of color. The blender is a soft, colorless pencil used to mix and blend colors together to create rich and vivid tones. They may be used individually or together. The Blender & Burnisher Set includes two of each style plus a sharpener and an eraser.