Have been using Igora Royal Highlifts - 10-0, 10-1 and 12-0 and 12-1 and combinations of same, for several years now - actually since they Igora Royal Highlilfts became available. We find the results to be simply wonderful - Far better than any other lift to achieve a warm medium blonde, or a lovely golden (not brassy) light blonde. Both tones achieved on medium to light-brown hair, with no scalp irritation for the client.