Product Description Muk Hybrid Equaliser 500ml. Muk Hybrid Equaliser can be added to any 8,9 or 10 level toner to adjust the operating pH level of the prepared colour, resulting in a toner performing as gentle as an acid colour on the scalp and hair. Muk Hybrid Equaliser is the perfect addition to any toner mix for all clients after a full scalp bleach or clients that have a sensitive scalp.