Temporary dye

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Haven’t had my hair coloured since JANUARY, as you can imagine, my roots look ridiculous - inches of dark brown with contrastive pale blonde lengths.

Now that I’m coming up to the 6 month mark, I can’t bare my colour.

Is there a completely temporary spray or wash in/wash out shampoo I can use on my blonde lengths to match my brunette? Or would it inevitably stain the blonde hair?