I found out the hard way that coloring my hair every 4 weeks was totally frying it.
It broke off easily, was brittle no matter what oil or conditioners or hair masks I used on it and I had split ends everywhere.
My hair is mostly brown with some grey but I've always liked red.
So about 8 years ago I decided to give henna a try.
I use body are quality henna (makes a very smooth paste that's easier to wash out and gives a wonderful color).
It IS time consuming.
I mix up my mix and let it sit on my head 4 or more hours - and I do this about once every 8 weeks.
But I get a wonderful auburn and the grey becomes coppery highlights.
And I mix it with vinegar or lemon juice.
No toxic chemicals, no ammonia smells - if you don't like the henna smell (some say it smells a bit like grass or hay), you can add a little spice (I like ground cloves) or a drop of lavender oil to your mix.
My hair is now silky, smooth, shiny, and as strong as it can get.
I can grow it a lot longer than I use to be able to.
I don't have a single split hair on my head.
I know - it's not for everyone.
Some people just don't care for it.
But henna has been very good for my hair, so I'll never go back to using any commercial dyes.
Since henna coats your hair shaft, the color you get will be unique because the color you start with shines through a little.
If you are totally grey, you will get a bright red using pure henna.
If that doesn't appeal to you, you can achieve other colors by combining henna with a percentage of indigo and/or alma.
You can get brown or even a very dark black.
If you want some golden color you can mix cassia with henna.
In case you are interested, you can find out everything you need to know here:
http://www.hennaforhair.com/mixes/