Hair spray

I have been colouring my hair for over 20 years and I used this product in between hair colours as it’s not recommended to colour every time a grey hair comes.
My stylist recommended L’Oréal spray - I bought black as my hair is dark. The spray works well but beware as it may discolour your fingers if you touch the hair and stains hats/ caps even if you allow it to dry.
It’s a mess and makes powder like splats all over the place. Not a fan of this spray.