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Photo: Karen Warren / Houston Chronicle Image 1 of / 9 Caption Close Image 2 of 9 Houston Astros starting pitcher Jarred Cosart (48) pitches during the first inning of an MLB baseball game at Minute Maid Park, Wednesday, June 4, 2014, in Houston. ( Karen Warren / Houston Chronicle ) Houston Astros starting pitcher Jarred Cosart (48) pitches during the first inning of an MLB baseball game at Minute Maid Park, Wednesday, June 4, 2014, in Houston. ( Karen Warren / Houston Chronicle ) Photo: Karen Warren / Houston Chronicle Image 3 of 9 during the first inning of an MLB baseball game at Minute Maid Park, Wednesday, June 4, 2014, in Houston. ( Karen Warren / Houston Chronicle ) during the first inning of an MLB baseball game at Minute Maid Park, Wednesday, June 4, 2014, in Houston. ( Karen Warren / Houston Chronicle ) Photo: Karen Warren / Houston Chronicle Image 4 of 9 Houston Astros starting pitcher Jarred Cosart (48) touches his cap between pitches in the fourth inning of an MLB baseball game at Minute Maid Park, Wednesday, June 4, 2014, in Houston. ( Karen Warren / Houston Chronicle ) less Houston Astros starting pitcher Jarred Cosart (48) touches his cap between pitches in the fourth inning of an MLB baseball game at Minute Maid Park, Wednesday, June 4, 2014, in Houston. ( Karen Warren / ... more Photo: Karen Warren / Houston Chronicle Image 5 of 9 Image 6 of 9 Houston Astros starting pitcher Jarred Cosart (48) touches his cap with his glove hand during the sixth inning of an MLB baseball game at Minute Maid Park, Wednesday, June 4, 2014, in Houston. ( Karen Warren / Houston Chronicle ) less Houston Astros starting pitcher Jarred Cosart (48) touches his cap with his glove hand during the sixth inning of an MLB baseball game at Minute Maid Park, Wednesday, June 4, 2014, in Houston. ( Karen Warren ... more Photo: Karen Warren / Houston Chronicle Image 7 of 9 Houston Astros starting pitcher Jarred Cosart (48) touches his cap with his glove hand during the sixth inning of an MLB baseball game at Minute Maid Park, Wednesday, June 4, 2014, in Houston. ( Karen Warren / Houston Chronicle ) less Houston Astros starting pitcher Jarred Cosart (48) touches his cap with his glove hand during the sixth inning of an MLB baseball game at Minute Maid Park, Wednesday, June 4, 2014, in Houston. ( Karen Warren ... more Photo: Karen Warren / Houston Chronicle Image 8 of 9 Houston Astros starting pitcher Jarred Cosart (48) walks back to the dugout in the third inning of an MLB baseball game at Minute Maid Park, Wednesday, June 4, 2014, in Houston. ( Karen Warren / Houston Chronicle ) less Houston Astros starting pitcher Jarred Cosart (48) walks back to the dugout in the third inning of an MLB baseball game at Minute Maid Park, Wednesday, June 4, 2014, in Houston. ( Karen Warren / Houston ... more Photo: Karen Warren / Houston Chronicle Image 9 of 9 Cosart said cap had only sweat and rosin Wednesday 1 / 9 Back to Gallery

Spotted with a white substance on the bill of his cap that he reached to Wednesday night in an excellent start against the Angels, Jarred Cosart said afterward that it was only rosin and sweat.

Manager Bo Porter said he was not aware of anything foreign on Cosart’s cap and the Angels did not issue any complaints.

Pitchers and foreign substances are a tired arena, because so many pitchers do use substances for the purpose of enhancing their grip — not to increase movement on their pitches. Better grip on pitches in many ways means a safer environment for hitters. However, the rules still don’t permit foreign substances, even those with a reasonable purpose.

Yankees pitcher Michael Pineda was suspended for having pine tar on his neck earlier this season. Clay Buchholz of the Red Sox was caught in a controversy last year.