Thank you for your response. Since your post was 3 years ago, I don't expect you would remember your specific sources, but it is fascinating to us that somebody who knew some key details about his painting/drawing technique in the 1950's recorded that information. And that person is likely now deceased-even my brother didn't know of some of these techniques he used. Can you suggest some search key words that you might have used at the time (2011) to get this artist information?