SYSTEM FOR CONFIRMING HIT LOCATIONS ON TENNIS COURT BOUNDARIES

摘要

The present invention is an article and process for determining the site of impact of a movable object on a treated surface, where a tennis ball is treated with a striking composition, and a boundary line region is treated with a receiving composition such that when the striking composition and the receiving composition are in physical contact, a colorimetric indicator is left on the receiving composition to indicate the point of contact.