Head and trunk of a male écorché figure, shown from behind, with the muscles and nerves indicated. Colour mezzotint by J. F. Gautier d'Agoty after himself, 1759.

Jacques Fabien Gautier d'Agoty, published a series of anatomy plates using a colour mezzotint process which had first been developed by Jacob Christoph Le Blon (1667-1741), in whose workshop Gautier d'Agoty had served as an assistant. In 1737, Le Blon obtained a copyright to publish a complete colour anatomy atlas, which never appeared. To Le Blon's process, which used the three colours of red, yellow and blue, Gautier d'Agoty added black and claimed the process to be his own invention.