Touched up my roots today with Schwarzkopf Oleo Intense in a dark blonde colour, which I’ve used before and is pretty much identical to my natural colour. I don’t have much grey apart from two white patches just above my ears. These have now gone completely orange. The rest of the hair looks absolutely fine, the sprinkling of grey hairs elsewhere have just blended in. These white patches usually just go dark blonde but today they are literally orange. What has gone wrong and what can I do to make them not-orange?