Can You Use Wella T18 Toner with a 40-Vol Developer?
If you’ve recently purchased a Wella T18 toner, you are likely looking for a light ashy blonde hair color or to tone down a more brassy orange or red dye. However, you might only have a 40-volume developer at home. Is it okay to use Wella T18 toner with a 40-volume developer? Highlights Can You …