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 (30) is treated with a striking composition (20), and a boundary line region (11, 12,13,14) is treated with a receiving composition (24) such that when the striking composition and the receiving composition are in physical contact, a colorimetric indictor is left on the receiving composition to indicate the point of contact.