System for confirming hit locations on tennis court boundaries
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 calorimetric indicator is left on the receiving composition to indicate the point of contact.
1. A process for determining point of contact of a movable object on a surface comprising:
(a) disposing a striking composition having a leuco dye to a movable object;
(b) disposing a receiving composition to a surface, wherein said receiving composition reversibly changes from colorless to colored at a pH between 3-11;
(c) observing a colorimetric indicia of contact at the point of impact on said surface portion where said movable object contacts said surface treated with said receiving composition; and
(d) removing from view said colorimetric indicia from said surface in less than 90 seconds.
2. The process of claim 1 wherein said surface is a tennis court.
3. The process of claim 1 wherein said movable object is a tennis ball.
4. The process of claim 1 wherein said striking composition is disposed on a tennis ball.
5. The process of claim 1 wherein said striking composition is applied using an organic solvent.
6. The process of claim 1 wherein said striking composition is applied using an aqueous solvent.
7. The process of claim 1 wherein said striking composition is applied using an aqueous-organic cosolvent.
8. The process of claim 1 wherein said striking composition is applied to at least 5 percent of said movable object.
9. The process of claim 1 wherein said striking composition applied to said movable object is on individual fibers of tennis ball felt.
10. The process of claim 1 wherein said receiving composition is applied to the inner and outer regions adjacent to boundary lines of a tennis court.
11. The process of claim 1 wherein said receiving composition is acidic and said striking composition is basic.
12. The process of claim 1 wherein said receiving composition is basic and said striking composition is acidic.
13. The process of claim 1 wherein said removal substantially eliminates said colorimetric indicia.
14. The process of claim 1 wherein said observing of colorimetric indicia is observed only on said tennis court surface.
15. The process of claim 1 wherein said receiving composition is applied to boundary lines.
16. A method for determining the point of impact of a tennis ball comprising:
(a) treating a tennis court surface with a receiving composition;
(b) treating a tennis ball with a striking composition;
(c) contacting treated tennis balls on said treated court;
(d) said contact creating on impact a colorimetric impression of said treated tennis ball on said tennis surface court treated with said receiving composition;
(e) observing the colorimetric change at the point the tennis ball, with a striking composition, contacts the tennis court with a receiving composition; and
(f) removing said calorimetric change from view on said tennis court with a removing composition in less than 90 seconds.
17. The method of claim 16 wherein said hard court is treated with said receiving composition in the area immediately outside tennis court side lines and end lines.
18. The method of claim 16 wherein said removing composition is an organic solvent, inorganic solvent, or combinations thereof.
19. The method of claim 16 wherein said receiving composition is applied to boundary lines.
20. An article for determining the area of impact on a treated surface wherein said article comprises a striking composition disposed on its surface, wherein said striking composition exhibits a colorimetric change on said treated surface that is removable with a removing composition in less than 90 seconds.
21. The article of claim 20 wherein said striking composition comprises a dye.
22. The article of claim 21 wherein said dye is applied using an organic solvent.
23. The article of claim 21 wherein said dye is applied using an aqueous solvent.
24. The article of claim 21 wherein said dye is applied using an aqueous-organic cosolvent.
25. The article of claim 24 wherein said article is a ball.
26. The article of claim 21 wherein said dye is applied to at least 5 percent of said movable object.