Celluloid is a transparent, flammable plastic which deteriorates when exposed to moisture. Celluloid dolls are made from cellulose nitrate, alcohol, fillers and camphor pigments.

1890-1937 (GER) made bisque & celluloid doll heads – Shultz Marke
Celluloid replaced ivory allowing items such as: jewelry, mantel clocks, charms, hat pins, buttons, buckles, stringed instrument parts, fountain pens, cutlery handles and toys for children to be inexpensively mass-produced.

c.? (RUS) made celluloid doll head girl’s tea party set tea-cozy (eBay item)
A toilet training aide for both toddlers and grown men – surely.
Anatomically correct, yet politically incorrect – somehow – somewhere.

c.1930s (GER) made celluloid doll
– altered by Hystoria