Hi balamouti -- the use of grey was recommended to me by a Salon stylist a few years back and it really does `sell`the system as your own naturally -growing hair. Why do you order synthetic grey ? Surely `normal`hair can be coloured grey too ? I`m not too sure about how synthetic behaves under those lights, but I reckon with that little amount sprinkled through the system , it wouldn`t be very noticeable really - anyway, most people in clubs are usually half way to the next galaxy and probably think everyone around them has 3 or 4 heads on their shoulders --the colour of the hairs wouldn`t be an issue as they are seeing in black-and-white anyway LOL !!!!!
Paul.