Will Loreal Excellence Hi-Color work without Developer.....?

All permanent dyes work by bleaching out your natural pigments and replacing them with the artificial colour.
Hi-Lift dyes are designed to give extra lift so you can get a vivid colour on dark hair, they use a higher strength peroxide for this than regular permanent dyes.
So, no, they won't work without the developer.
When you want to add colour without any lift you don't need a hi-lift dye, that is the opposite of what they are designed for.
You can use a brown direct dye (one that does not use developer at all) such as those made by Adore. They will not damage your hair further. ( Three processes with hi-lift dyes is a lot, they are supposed to be used on virgin hair only, you may start to see some damage in the coming weeks)

All permanent dyes work by bleaching out your natural pigments and replacing them with the artificial colour.
Hi-Lift dyes are designed to give extra lift so you can get a vivid colour on dark hair, they use a higher strength peroxide for this than regular permanent dyes.
So, no, they won't work without the developer.
When you want to add colour without any lift you don't need a hi-lift dye, that is the opposite of what they are designed for.
You can use a brown direct dye (one that does not use developer at all) such as those made by Adore. They will not damage your hair further. ( Three processes with hi-lift dyes is a lot, they are supposed to be used on virgin hair only, you may start to see some damage in the coming weeks)

Hi,
Thanks for the response!  I am a newbie when it comes to coloring so it seams that I have already done damage to my hair.

You said that 3 processes of Hi color is a lot,  so what does one do when the color starts to fade and the original begins to show? Dies that mean no more Hi color and to use something like the Adore you mentioned?

Is it true that the Hi color should be used once and only once throughout the life of hair coloring?

I'm a bit confused and new and hoping you can clear this up further.

Thanks!

Hi-Colour is really harsh, so yes it should only be used on virgin hair. So it is OK to use it on your re-growth.
When the colour fades, even with regular permanent dyes, more damage is caused by constantly dyeing over the same hair. This is why we don't recommend repeated dyeing with any oxidative dye, all chemical damage is permanent and cumulative.
Topping up the colour with a direct dye is much more effective and safer for your hair.