I have blonde highlights all over my head, so it's mostly blonde, but I've never used an actual toner on my hair, only purple shampoo/conditioner. My mum gave me a toner that she uses on her hair (Jerome Russel 'Steel' Maximum Colour Toner), so it's for quite grey hair, as indicated by my mum and the colour on the box. Can I still use it? I don't want grey hair, just to eradicate some of the brassiness. It's says to leave it on for a maximum of 30 minutes, but says very dry hair could process in 10-15 minutes. My hair isn't super dry, but could I maybe leave it on for 5-10 minutes without it turning grey? Or should I just buy another toner? Really confused.