Innes has been making watercolours for more than 25 yearsHe began to explore the medium when he was asked to do a show at the Kunsthaus, in Zurich. He says: "I blithely said yes to an exhibition without ever having made a watercolour before. It caused a lot of stress at the time, but I gradually developed a way of working with paper and pigment.

I am still making watercolours, although they have changed over the years, and now I realise that they inform the oil paintings more and more. When you place two pigments together, either opposite or complementary, and then dissolve them in water you achieve a completely new colour which only reveals itself on the paper.

I am often surprised and disappointed in the same hour.

"It has been a couple of years since I last spent time with watercolours. When lockdown occurred, in March 2020, I was setting up a new studio, overlooking a fjord in Oslo. It was unfamiliar, and I had no reference to earlier works as I do in EdinburghI started to work on a new watercolour series, focusing on them for a week at a time, always starting the day with a black and white one, just to get my hand in … the black and white ones are the most elusive.