Permanent bright hair dyes - do they exist?

L'Oreal Hi Color!

I have used this MANY times and have had great looking hair!!! It IS permanent! The only thing is that the only colors they really have are shades of red. I have used their color RED and Magenta and they both look great. The red is RED and the magenta is a pinkish red. Very pretty and lasts about 2 1/2 months.

I get it from Sally's Beauty Supply and you have to mix it with developer!

Pravana is pretty much permanent depending on the color. I have used their magenta and it wouldn't budge- no matter how many colors I dyed over it the color would eventually revert back to magenta. this lasted for MONTHS.

Their blue, violet and green (which is actually kind of blue-ish) faded pretty quickly on my hair though. The fading was really noticeable around a month after coloring. 

has anyone heard of Kadus? its for professional use. am sure you'll find summat on the internet. there mix tones are permanent. nd they r actually permanent. one mix tone was like cerise by directions nd went on bleached nd unbleached hair nd its gorgeous <3 brighter on bleached ofc but not as vibrant as cerise. you cud use tht for permanent nd then use cerise to brighten it up 🙂 xxxxxxxxx

I did my hair with Feria Color Boost Pure Scarlet P67 and it has come out really bright
and i put it on over unbleached hair, I used colour b4 first and then Feria and its as bright as sxf cherry bomb  😀