In 2008 the Art Institute of Chicago had a special Winslow Homer exhibit, and they created a related online site that's still live, called "Winslow Homer, The Color of Light, Behind the Scenes." Here you can learn about some of his techniques and materials, which are pretty interesting to me, as a watercolor painter. I was amazed to see how much "messing around" he was able to get away with. He lifted, sanded, scraped, blotted, spattered, you name it. You can click through the site or, if you're impatient like me, you can go to this list of topics and click the ones you want to see. I was very interested in how messy his palette was.