I now intend to produce a series of these works in a given range of colours.
This experiment was also successful, but I would need to use a file to tidy up the edges of the hole.
I was attracted to the colours of nail varnish, and thought it may be interesting to use the nail varnish in some drawings. The surface quality is rather lush, especially when applied to the matt grey plaster.
These are the colours of plaster squares I made today.