During the first lockdown I subscribed to e-Salon and had regular deliveries of my hair dye. During this lockdown I haven't bothered to dye my hair as I was WFH but I'm due back into the office on Monday and I look like a pigeon has splat on my head.
I have just found a delivery I received in May of last year from the e-salon which hasn't been opened. Would it be ok to still use this or is it too old? The developer and colour are in separate bottles and are untouched.