Plasticine
Plasticine is a putty like modelling material which unlike other types of modelling clay does not dry out with exposure to air, cannot be hardened by firing. Composed of calcium salts, petroleum jelly long-chain aliphatic acids (principally stearic acid, it is non-toxic, soft and malleable meaning it can both retain it's shape and be reshaped again and again.
Thomas Hardy
by Theodore Spicer-Simson
1921
NPG 2050
H.G. Wells
by Theodore Spicer-Simson
circa 1922
NPG 2055
Arnold Bennett
by Theodore Spicer-Simson
1922
NPG 2043
Sir Henry John Newbolt
by Theodore Spicer-Simson
circa 1922
NPG 2054