heel.balln.(名词)A wax colored with lampblack that is used to stain and polish the edges of the soles and heels of shoes or take rubbings of brass or inscriptions.黑色或棕色的蜡:烟灰色的蜡,用于鞋跟或鞋底的染色和打光,或用于铜印或纸印图案