12.The variety of plastic objects at risk is dizzying: early radios, avant-garde sculptures, celluloid animation sills from Disney films, the first artificial heart.
16.By the middle of the century, American entrepreneurs discovered that dipping nitrocellulose in wax turned it into a hard, enduring substance, and patented it as celluloid.
18.So in the late 1800s and early 1900s, celluloid accessories were everywhere -- buttons, jewelry, eyeglass frames, toys, and little hair combs that ladies would wear.
19.There were even reports of entire stores burning down because they stored their celluloid stuff too close to windows and mirrors on hot summer days.
20.A 38mm ball made from celluloid quickly became the standard and was used all the way up until very recently when in 2000 the ball size increased to 40mm.