I stopped colouring my hair last September. I'd had it cut short, hated it so decided I might as well go grey while I was feeling ugly 
Nearly I year on I don't regret stopping colouring at all.. I love my white stripes in my fringe and scattered grey. But the the remains of my old colour (was mid brown) have now faded to a yellowy shade. I have tried a 'touch of silver' conditioner but it hasn't done anything.
Any non hair dye suggestion for keeping my white hair white and my coloured ends less yellow please? I'm getting it trimmed every 3 months as the grey grows in so it will be another year before it's all natural.