Broccoli has beautiful silver-green leaves, but I'm having trouble matching the colors my eye perceives to the colors I can mix in my paints. So I tried making a Viridometer, a green version of a Cyanometer-- a tool for matching perceived colors with actual colors. James Gurney recommended the Cyanometer in his book, Color and Light.
I went to Lowe's and got some (free) Valspar paint chips, which have these nice little windows:
...And compared them to the lights and shadows on the broccoli leaves. The results were startling. The colors that matched the best were much darker than I thought. I'm still not sure how to apply this new knowledge to painting.