Task: Question Generation
Input (English): Passage: The Chargers lost 35-24 to the Denver Broncos after leading 24-0 at halftime. The loss tied San Diego with Denver for the AFC West lead with a 3-3 record. Rivers had a career-high six turnovers, five in the second half. One of his interceptions and one of his fumbles were returned by the Broncos for touchdowns. He had four interceptions, including three in the fourth quarter. The Chargers built their first-half lead after two special teams fumble recoveries and an 80-yard touchdown return by Quentin Jammer off a Peyton Manning interception. It was the first score of Jammer's career. Rivers also threw two touchdowns to Antonio Gates in the first half. After the game, Fox Sports insider Jay Glazer reported that the Chargers used an "illegal stickum-type substance" during the game, and a Chargers equipment member was caught by the line judge hiding and handing out the substance to players, which was confiscated by the league. Chargers head coach Norv Turner denied that the team cheated, and stated that the object was a towel with a substance that dries footballs. The product was later identified as Gorilla Gold Grip Enhancer. On November 7, the league stated that the Chargers did not cheat, but fined the team $20,000.
Output (English): What was the illegal substance named?