Vulcanized rubber process' value $1200 answer poison round Jeopardy! Show_number 5626 category THE MATERIAL WORLD air_date 2000-01-18 question 'This Frenchman painted many portraits by this Chinese river' value $800 answer Allan Ginsberg round Double Jeopardy! Show_number 1795 category BUSINESS & INDUSTRY air_date 1990-01-12 question 'In 1938 DuPont made toothbrushes not stockings its.