Twenty volume should not be used as a developer for toner or glazes especially when wanting to maintain a natural base.

Everything You Need to Know About Hair Developer - Total Beauty

When you have brown hair and you want to lighten your hair up a little bit but not too much, then 20 volume developer is perfect for this situation without any doubt. The difference between 20-volume and lower number volumes is that with 20-volume you get a stronger lift, which allows you to remove more protein from the hair before washing them out. However, it is critical to note that this strength of developer is harsh on the hair and may cause hair burns if not used correctly. Preparations include pre-lightening hair, damp locks, and allergy and strand tests, which we will cover next. Running out of developer and hair color halfway into the dyeing process can cause your hair to come out unevenly or improperly.

Many toners work with 10 volume developers when applying permanent, no-lift hair color since it is the least destructive to the hair and all you want to do is deposit a tone to erase undesired color in your hair. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development.

How to Choose Developer for Hair Color: Step-By-Step Guide

Very often it is the ends which are porous, whereas the roots and mid-lengths are in much better condition. Massage the toner into your scalp: Toner can be an irritant, so steer clear of massaging it into your scalp.When used with bleach, 20 volume is a powerful tool lifting 1-9 levels depending on the bleach, method of application, and hair type/history.