WHAT IS IT?
No-Yellow-Pro Booster is the perfect product for creating a salon effect quickly and professionally. It contains a powerful blue pigment that eliminates unwanted yellow undertones at a stroke.
HOW TO USE?
Add a maximum of 5% to the bleaching mixture if the base colour is 4 or darker; for lighter shades, reduce proportionately to a maximum of 1% for a base colour of 8.