Best Dyed Red Head Colour Shampoo & conditioner

[SwimmingintheDeepBLUESea]

I've started having my naturally dark brown hair dyed red (in a salon). It fades from bright red to a reddish brown fairly quickly. What is the best shampoo & conditioner for keeping red coloured hair bright?

I initially tried Aussie for coloured hair (didn't seem to stop the fade) and the John Frieda red one (seemed to deepen the red causing it to darken).

I have heard that people with dyed red hair mix a bit of dye into their conditioner to refresh it? Sort of like purple shampoo/conditioner I guess, but with more pigment as you’re not just toning

You could have a look at revlon nutricolour, they do a red, I use the orange, straight, mixed with yellow or diluted in conditioner, using it straight conditions my hair really well, I leave it afew hours if I've time and lasts decent ,think it says to leave 3 minutes

I use Scott Cornwall colour restorer on mine once a week - it's a complete game changer.