Sensitive scalp & Schwarzkopf Igora royal works for me. Goldwell Topchic also was good on+
It's the developer in the toners/glosses causes my fragile, heavily lightened to break without fail
PBI- I do not agree with the first part. I have never done DIY, I've only went to high-end salons
Can you provide a link to the Elumen Clear? I looked on Amazon & see Goldwell Elumen S & C.