Swimming off the rocks 3 4th September 2020 Chris Jessop Lovely afternoon lighting on September 1st:a two hour session with the oil paints –their first outing in 2020!I love plein air oil painting: you know your colours are right,because you’re always checking that they are right.In case you’re wondering, I NEVER use black: I mix my very darkest colours from raw umber and untramarine deep.