Hey! This is my first post, but I’ve been a long-time fan of this site and always end up finding answers to any questions I may have on here. But I couldn’t find a firm answer to this one: I ALWAYS put coconut oil in my hair before bleach, so I automatically slapped some on before I did my toner. As I was waiting for it to soak up, I googled around and found some people saying not to do it a it will create too much of a barrier for the toner to work. However, others saying it’s fine. Have any of you had experience with this? Or at least a more educated insight on what the outcome will be? Any answers are EXTREMELY appreciated :)
Since toner does actually deposit a small amount of colour, I'd personally avoid coconut oil, because it could create a barrier. Blue pigments used in white and silver tend to be relatively large molecules compared to other colours like red and brown, so they already have a bit of trouble getting through the upper layers of your hair structure. I do also think it depends on porosity. If your hair tends to soak up dyes really well, I think it wouldn't make as much of a difference on a permanent toner like Wella.
last time I went to a hairdresser, she told me coconut oil is a bad idea, at least the one you can get at groceries, or even biological : their molecules are too large. The hair industry uses it after having reduced the size of the molecules. so using it is probably an illusion, and soaking too much of it will certainly affect the way your dye or bleach or toner will work. (I tried it but small amounts, I didn't observe any harm).