It depends on HOW you're determining whether or not you're in ketosis. If you depend on the strips, ANY change of color means ketosis... you are or you aren't, it's not a matter of degree by the color. Actually, the darker colors sometimes mean you're slightly dehydrated!

Go way to the top of the page, where the green bar is, and click on "tips". It should lead you to where you can find a GREAT article explaining ketones and the test strips in great detail.