Daniel Burleigh Parkhurst, The Painter in Oil
“ You must expect that all color will change somewhat. But you need not use those which change immediately or markedly, and you may use them in a way which will tend to make them change as little as may be. Colors have stood for years, and what is practical permanence, not perfect permanence, is all you need look for. If you think too much of the permanence of your colors, it will interfere with the directness of your study. Therefore, decide on a palette which is as complete and safe as you can make it, excluding the notably bad pigments, and think no more about it. ”
