Single Process Dye after Wella Demi ?

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    Atomixposted 9 months ago

    Single Process Dye after Wella Demi ?

    I have been dyeing my gray (75% in one small section and random strands elsewhere) using Wella Demi Permanent 5N.  I want to highlight my hair with a single process dye to reduce the likelihood of brassiness that I get from bleaching and toning it. 

    How long do I need to wait for the single process to take work? It has been 45 days since I last used the Wella Demi.  Do I need to let everything grow out?  My grays are showing- some are pure white whlie others look yellow.