On April 24th instructor Lucy Parker gave a brief talk to the Wednesday Dupont class on the zorn pallet used by many artists She described the colours used as yellow ocher, cad red medium. black and white. She said that in using oils, the dark colors should be laid down first. This was a brief outline of her colour mix. 
It is described as follows on line:
“The Zorn palette refers to a palette of colors attributed to the great Swedish artist, Anders Zorn (18 February 1860 – 22 August 1920). It consists of just 4 colors being yellow ochre, ivory black, vermilion and titanium white. Cadmium red light is commonly used in place of vermilion by modern day artists.
Whilst this may seem like an extremely limited range of colors, Zorn demonstrated through his paintings just what is possible with such a limited palette. Here are some of his paintings which appear to utilize the Zorn palette:”
