Sandra Blow made her impactful abstract compositions using both traditional and unusual materials. For Green and White, she incorporated blended ash made from burning nuts in her studio stove. While the painting was still unfinished, someone entered Blow’s studio and slashed the canvas with a knife. Determined not to ‘lose the painting’, she sewed the edges together and stuck a strip of canvas on the back and front, then painted over it. ‘Miraculously… it was a perfect conclusion to the whole painting’, she said.