August 1882: "I believe this is a practical palette, with sound colours. Ultramarine, carmine or something else are added if absolutely necessary."
November 1885: "That’s a question — painting so that it hardens properly — that it rather comes down to, to my mind — it’s a pity that some enduring colours like cobalt are so expensive."
September 1888: "In case you’re hard up, I can manage perfectly well without the expensive blues and the carmine. 1 tube of Prussian blue goes as far as 6 ultramarine or cobalt and costs 3 times less."