She says of him: «His paintings range in style from tonalism and Impressionism to prophecies of Abstract expressionism. (en.wikipedia.org)
Photography was «born of» absolute tonalism, either sepia or gray, depending on which of the only two initial photographic processes known; salt prints or Blanquart - Evrard prints. (hamptonsarthub.com)
Kahn remembered the changes in location again instigating the evolution of his painting: «I began to let the color come through on my canvases... How far could I go towards color without giving up tonalism?» (milesmcenery.com)