Clay modeling (or clay model making) for automobile prototypes was first introduced in the 1930s by automobile designer Harley Earl, head of the General Motors styling studio (known initially as the Art and Color Section, and later as the Design and Styling Department).

Industrial plasticine is a modeling material which is mainly used by automotive design studios. It was developed as an industrial version of plasticine or hobby clay.

Industrial plasticine is based on wax and typically contains sulfur, which gives a characteristic smell to most artificial clays. The styled object can be used to create moulds. However, largely because sulfur interfered with some mould-making processes, especially if clay surfaces are unsealed surfaces and platinum-cure Room Temperature Vulcanization silicone was used, sulfur-free variants are now available; these are usually much lighter than sulfur-containing clays.

More recently, clay models are 3D scanned into a digital file using laser technology. This is then opened in Computer-aided design software to be worked further. If a negative mold is required, this data is sent to a milling machine.

Video Credit: www.audi.com & www.bmw.com

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