No - burgundy/purple means you're dehydrated - you shouldn't really ever see purple! Even traces is fine (look at the thing on the side of the container). Some people will NEVER register on ketostix despite being in ketosis, so don't get hung up on the colour. If you're abstaining and losing weight, then you'll be in ketosis - you won't need a silly stick to tell you!
I'm usually the light pink colour, but sometimes I show negative even when I've done nothing different. The amoun tof water you're drinking can make a difference to the colour on the day.