Hi,
There should be a colour chart on your ketosis sticks box. I use Ketostix and on the side of the bottle there is a chart which shows you the different colours for Ketosis. A rosy pink colour to dark purple means you are in Ketosis. Not 100% sure but I think I have read on here before that a dark purple colour means you are a bit dehydrated? Not 100% sure. Hope someone else can shed some more light on it for you! Good luck! x