I have had 3 Dr. Martin's sets for a very long time. I struggle with them every time I bring them out because it is hard for me to determine the colors while they are in the bottle. They all look so dark. I poured about 7 colors in little tiny containers and I tried them on location when I went out with the San Diego Urban Sketchers. Luckily there was a lot of white in my subject so I didn't have to do too much painting with them. The type of paper has a major effect on the outcome. I used an old cheap water color paper that really soaked up the paint.
Heritage Park, San Marcos, California