That's amazing, thank you! 0/30 is gold, apparently, and 0/33 is intense gold.
I remember in the first salon I worked in, they once diluted mix tone with warm water and poured it straight on the hair as part of a colour correction. Is that still a thing? They mainly used mix tones to intensify colours though - mostly reds. Re using 0/28 for colour correction, would you just add that to a chosen shade to counteract the red? I.e. someone with a very warm base 5 wants to go to a 5/1, for example, you'd add the 0/28 mix tone to 5/1 as one step?
0/00 to remove excess tone - how would you use that? I feel it's one I should learn more about.
I'm totally going off on a tangent from the original thread lol, but I'm learning a lot