plastilins

Plastilins, also known as plasticine in some regions, are a family of non-drying, oil-based modeling clays used for sculpture, design studies, and stop-motion animation. Unlike air-dry or polymer clays, plastilins do not harden over time, remaining soft and malleable after repeated manipulation. They can be blended, rolled out, and textured and can be reused indefinitely. The term plastilin is used in several languages to refer to this type of material.

Composition and properties vary by brand, but plastilins typically consist of mineral oil, waxes, and pigments bound in a soft, grease-like base. The oil-based formulation keeps the material pliable and forgiving to work with, though it may leave an oily residue on hands and surfaces and can stain fabrics if colors are not handled carefully. Plastilins are generally non-toxic and suitable for education and studio work, but users may prefer protective work surfaces and good cleaning practices due to their greasy nature.

Uses and applications include sculpture studies, concept modeling, and stop-motion animation. They are favored for their ability to hold fine details and for being reworkable without drying out. They can be mixed with other clays and materials, though they may adhere to non-porous surfaces and skin. Storage is typically in airtight containers or wrapped to prevent drying and oil separation; exposure to heat can cause oil separation or softening.

Historically, the material dates back to the late 19th century with the development of non-drying modeling clays, with Plasticine by William Harbutt being a notable early example. In many languages, plastilin or plastiline remains a standard term for this class of oil-based modelling clays and continues to be used in education, art, and animation.