Can anyone recommend a blue shampoo for dyed brunette hair?

[deedeemegadoodoo]

Can anyone recommend a blue shampoo for brunette hair? I’m naturally brown but dye around every 6 weeks to cover greys, and I want to avoid the red tinge I get after a few weeks.

I’m using the Aussie Purple Shampoo on my dyed mid-brown hair. It says it’s purple but it’s actually very deep blue. Seems to be keeping the red tinge at bay.

The best blue shampoo is fanola. The fanola purple shampoo forever absolutely stinks!