How do you keep a dyed red semi-permanent colour lasting longer?

I want to dye my hair with random colors like red blue purple green etc. but with them being unnatural colors they dont stay ...

I dyed my hair permanently brown, but its faded to a more caramel colour. Now I want to go red, but after going red before, I...

So I have blondish/brown [dark mousy?] colour hair. I recently tried to dye it with toners a dark brown [mahogony]. But it re...

Is there anything you can do to your hair when its already dyed to make that color last longer or not fade out?

I dyed my hair red about a month or 2 ago with the Live colouring box, and my roots are beginning to come back. If I buy the ...

I had light blonde hair and I decided to dye it red I used xl live passion red hair dye But its faded like after a week :/ It...

how long does demi-permanent hair dye stay in? im putting either black or blonde hight lights in my hair but I dont want them...

I have recently coloured my blonde hair a dark chocolate brown colour. I did everything right - I put a red through it first ...

Is there a product out there (Canada) that can make my hair dye last longer? Like a spray or anything?

My friend and I dyed our hair blue for her sister's wedding. We used bleach to strip away any other color that would prevent ...