Unfortunately this did not work as expected. Did lots of research and followed the instructions but it did nothing. Huge waste of money. I noticed no change to my hair which is a level 9. Did 2:1 ratio and left on for 15 minutes. The product did not even change colour on my hair as I was advised it would. Don't bother, waste of time and money.
P.S Hair empire advised shipping would take 3-5 days but it took over a week to arrive after ordering so don't expect it to turn up fast.