During the war, many British escape maps were printed on silk, quite often from silk rejected during the manufacture of parachutes. In fact, in the spring of 1944, the US shipped 1 million yards of slightly damaged parachute silk from New York warehouses to the British for use in making escape maps.[33] Nonetheless, because of the scarcity of silk, in 1943 the British also began using viscose rayon and cuprammonuium, a form of rayon commonly known as Bemberg silk or copper rayon. Rayon, unlike most man-made fibers is not synthetic but is made from wood pulp. The properties of viscous rayon and cuprammonium rayon are similar although they are made by different processes.
In 1943 a series of cloth escape maps were produced that are immediately recognized by their vivid colors. These maps are of the European Theater and were issued to Allied pilots of the US, RAF, and RCAF. Printed by the company of John Waddington, Ltd, the maps consist of eight colors and are primarily at a scale of 1:1,000,000 with larger scale inserts. There are ten sheets in this series, which are composites of various paper sheets of the then existing International Map of the World, unlike the previous escape maps which were exact copies of existing paper sheets. The sheets are numbered with the prefix 43 followed by one of the upper case letters: A, B, C, D, E, F, G, H, and K (east) and K (west). When all the maps are laid out they basically overlap to provide a complete map of Europe. The maps were usually printed on both sides, although single-side versions exist. Normally, the maps were printed sequentially--A on one side and B on the other side; C on one side and D on the other side--although that was not always the case. For example, maps with C on one side and E on the other side are also occasionally found.
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