Siolieten
Mr. Sigmund had knowledge of the production process and colouring of toys. He learned this technique from the toy factory Schowanek in Czechoslovakia, where he purchased and had his toys made until the annexation by Germany in 1938. Sigmund arranged for the large drums needed for colouring wooden parts with the new aniline dyes of that time. These drums came from a factory in Sauerland.

Sio further developed this colouring technique, which became known as "Siolieten". The Siolieten colouring process was strictly guarded by Sio. Visitors were not allowed and no photos could be taken. For each colouring, different parts were put together in the colour drum. The colouring happened as the parts collided with each other and the colour was transferred. By mixing large and small parts, an even colouring was possible, which coloured even the smallest corners.

The mixing of parts required strict planning of the production quantities for the toy production.

The laundry baskets filled with parts were a familiar sight in the factory.