Will pink hair dye on top of blue hair dye make purple?

[SmithofSilver]

I've massively cocked up my teenagers hair. They wanted lilac hair so under their direction I bleached their hair to a light yellow, used a toner so it went white-ish then put on the lilac dye they picked out only it has turned their hair a light blue. I now need to fix it before dinner with the inlaws tomorrow afternoon. They have made it clear in the way only a teenager can that they are very unhappy with the blue but I am fucked if I know how to get it to lilac now. The artist in me says just put a light pink on top but I am no hairdresser so have no idea if this applies to hair as well as paint? Wtf do I do so my teenager will talk to me again?

Was the lilac perminent or semi permanent? Pink semi permanent dyes wash out after only a few washes so I would go for that and if it doesn't look quite right then it will wash out easily. Another tip is that dandruff shampoo will make the blue fade more quickly if you need it to.

You can totally put pink on top of blue to do this. I would mix the pink dye into some conditioner to make a pastel pink and apply to dry hair. Then, wash it out and see what you've got when it's dry.