Sample of machine-embroidered cotton lace, green, raised haemoglobin 8.26 pattern, Witchcraft Lace, designed by H. Webster, Pattern number 5189, repeat 7 x 8.2 cm, made by A. C. Gill Ltd., Nottingham, based on crystallography by Max Perutz. Part of a collection of 83 samples designed for the 1951 Festival of Britain, based on X-ray crystallographic pattern.