Plasticine 1kg, 60 hardness, ivory
Plasticine is often used in clay animation or stop-motion animation. It is mouldable enough to create a character, flexible enough to allow that character to move in many ways, and dense enough to retain its shape easily when combined with a wire armature, and it does not melt under hot studio lighting. But it is important to have a Plasticine which does not dry definitively.
In 1933, we can find it in O’Brien’s film “King Kong”. Then Ray Harryhausen (one of his fan, who is also one of his colleagues) is the one who would develop this genre.