Artists are not inhibited by any technical constraints, and can make the paintings in their communities without any assistance. Once the painting is finished, the acetate sheets are carefully separated. The exposure light hardens the emulsion on the screen, but, as it can't shine through the paint the artist has used on his or her acetate, the painted areas don't harden and can be washed out with a hose after the exposure is complete. A stencil remains on the screen, and the printer can pull ink across the screen and through the open areas of the stencil onto sheets of paper below. A new screen is made for each colour.
Printing is fast and the prints are bright and richly coloured.
Lithography Lithography is traditionally done on a limestone slab. This medium is especially appropriate for artists in Arnhem Land, where images have been recorded on rock walls and caves for many centuries. Textile designers at Ernabella have also adapted well to drawing on stone. Using a greasy ink or crayon, the artists paint or draw their design onto the stone. It is then chemically treated to establish the drawing and make the background areas water-receptive.