The printmaking technique of lithography gained popularity in the 19th century as a process faster and cheaper than copper engraving or woodblock printing. When color lithography was introduced, it spread posters, books and sheet music to the masses. The vivid illustrations made possible by color lithography also gave rise to product branding and advertising. Jay T. Last holds the largest private collection of color lithography in America, and is donating it to The Huntington Library, which will showcase a selection beginning October 17. Larry Mantle discusses The Huntington's new exhibit "The Color Explosion: Nineteenth-Century American Lithography from the Jay T. Last Collection."