Color is relative. Depending on the surrounding colors, ambient light in the room, and a variety of other factors - your results will vary. This video explores the idea of relative color, and suggests some tips for carefully observing color. Training your eye to carefully ovserve color is challenging, but very worthwhile. Good luck! If you want to see the earlier video mentioned in the post, here it is -- "guess that color" 

AuthorMatt Kohr