This past Sunday i decided to use a bleach bath to lift my roots. Only problem was i used a 20 volume afraid of doing too much damage and did not take into consideration that the bath would dillute it meaning that i SHOULD have used a 30. After realizing wella t18 would not work and sallys had just closed i went into panic as i had work the next morning. With that being said, i put a box blonde in to make it look as normal as possible. The t18 toner grabbed at the ends quickly leaving some silver which the box did not cover. The next day one of the sallys reps advised me that i could try a remover kit to take the box color out, and see if it would take the toner out as well and try wella t10 as it had both violet and blue to cover both yellow and orange tones left from bot lifting enough. I used the remover kit which got the boxed color out but did not lift the silver. I felt that my hair would not be able to handle bleach again so lifting more was not an option. This time i used the t10 toner and also applied to the roots with a brush instead of a bottle to keep it from getting to the ends, put a cap on, and at the last minute i ran through the ends and immediately rinsed as the ends had been grabbing so quickly. The roots are a nice color, and the rest is now more silver than previously. I know how to remove the toner out and get rid of the silver without a problem so that part doesnt really worry me. My question boils down to this: i watched a video of someone using this toner that had hair that was not lifted as much as mine was and hers came out perfect without any warmth. We had used 20 volume as my ends took so fast, but if i am able to keep the toner off the ends which i was able to this time. What are some thoughts regarding reapplying the same toner (t10) to my roots with a 10 volume. Is there a chance it would deposit closer to the way it should and without the warmth? And if reapplying, can it go directly over whats there now or do i need to remove that prior? I also set up an appointment at my salon for a redken heatcure service for tomorrow but now im also curious if i am able to do this if i should do so before or after the appointment.
It sounds like it's mostly an issue of processing time, since you ended up rinsing so quickly after application. T10 does have a bit of lift to it, especially when using 20 vol), but it takes a minimum of 30 minutes in my experience to go up one level. It does sound like you need a bit more lift in addition to more colour depositing, so another round with 10 vol may be the right move, but, I'd highly, highly recommend a strand test first, since your roots have gone through a fair amount of processing now, so one more might pull it over the edge.
By the way, if you're trying to touch up a fading toner, I'd highly suggest using a semi-permanent toner or just leaving purple shampoo on dry, clean hair for an hour or two. The Wella toners are quite harsh and aren't the best option for touch-ups. They do provide a small amount of lift, which is helpful is some circumstances, but I'd generally try the less damaging strategy first. I also find their longevity to be about the same as home-made violet toners.