Toning will not keep in my hair!

A pic of your hair would really help. What peroxide are you using with the T18?

Color Charm 20vol, how do I post a photo? I'm technologically challenged hah

I'm having the same issue! I want white hair and while my hair is a very very light platinum I can't seem to get it to white even with toner.

Do you have red in your hair? I'm a strawberry blonde and I'm wondering if that's the issue

Damaged hair will not hold color properly. that includes toners

Surprisingly since I've been doing it over a period and doin lost of masques and deep conditioning my hair isn't even that damaged yet I've had it go a lot smoother with gummy hair before :/ I have red undertones in natural chocolate brown hair 🙁 I even stripped my hair before taking this on again. It may be a bad idea but I think I'm jut going to throw a box ash-blonde on this and hope for the best.

bleach damage can take a while to show, so even if the process was slow, you can still get damage. The same thing happened to me when I went white. I eventually did get it white but parts of my hair didnt want to tone. I had to let it rest for 3 months, before it took evenly.
I wouldn't use anymore peroxide if I were you. you would be better off finding an ash toner which does not contain peroxide or using a dye by adore.

Edit: if your hair is not the color of the inside of a banana, then you are better off trying blue toners instead of the purple ones.

Constantly bleaching and using box dye is unlikely to help. What colour is your hair under the toners? We really need a pic to advise.
You said it is already 'very light' if that is true there is no need to use any further peroxide based products. It is perfectly possible to tone bleached hair without oxidative toners, and much safer for your hair.

When hair has been very processed, two specific things can happen:-

1.  The most notable is the cuticle has become so processed it remains in a permanently raised or even destroyed state.  In this state, it become impossible for the hair to hold blue or violet direct dye pigments needed for toning.  Instead, they simply wash out.  Using peroxide or ammonia based products to tone will make this issue even worse - as it will just keep raising the cuticle or damaging it further.

2.  The other issue I come across is 'locked down' hair.  In this situation, silicone has been used (at some point) on the hair and it's coating the surface and preventing toning.  A big problem is emerging with these lightening blonde or platinum hair colourants as they contain polymers and silicones that sit within and on the hair.  Therefore, if they do not lighten enough the platinum tones cannot neutralise, however the hair has been 'locked down' and will not accept tone.

My first piece of advice is to clarify the hair well and then try to tone.  At some point you should find the toning working, but if it's due to damage, you might have to give a mild tone after each wash.

Kind Regards

Scott Cornwall