I had a hard time with this because I found a little bit of black goes a long way when you are mixing with a color to make it darker. I spend a lot of time trying to get good looking dark colors it was frustrating at times. I also realized after the fact that I need to use the same color all the way across when doing the symbols inside of the solid colors. I would go back and do that right the next time and work more on creating a good blended color strip for each used color.