heelball

heel.ball

n.（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