Rícino resin is a plant-based polymer derived from castor oil (Ricinus communis), a material developed at the University of São Paulo, Brazil. The material’s properties, such as its physico-chemical stability, elasticity and ability to adhere to porous materials, make it a very efficient sustainable substitute for petroleum derivatives.

It is mainly used in civil engineering as a waterproofing agent or varnish.

Estúdio Rain’s work has focused on developing a way to cast large quantities of the material, which is usually used in thin layers, to make objects and diversify its use. Its malleability and thermal stability, combined with its amber and transparent colour, inspired the development of a series of objects that features the natural polymer as a central element. The resin casting brings out the living aspect of the material, enhancing its aesthetic qualities and proposing an alternative application to its original technical use.