Hi just looking for advice I am a hairdresser and currently have wella colour creates on my hair has any one ever just coloured over pink hair to brown and it's gone okay? It has faded now to a more samon colour and want to put illumina 7/81 over it. I've been looking and it different people who have done it Nd all looks okay just dont know whether to pre pig first.. any advise would be great thanks xx