William Brinker III passed away Jan. 25. 2004. He was 59.      After serving in Vietnam as a Marine Corps medic, Mr. Brinker became a major figure in the fluorescent pigment and ink industry, beginning with DayGlo in 1969 and then joining Radiant Color in 1991 as its litho inks chemist. He retired from Radiant Color in 2001.      “I was very sorry to learn of Bill’s passing,” said Robert Hess, vice president of Radiant Color. “We worked and socialized together for many years. He helped Radia...