Igora Royal Booster / Neutraliser
Like Booster, the Neutralisers are for mixing with other IGORA ROYAL shades to neutralise warmth. They're great when you want to create cool tone directions. The amount to use varies with level: 5% of colour on levels 8 and 9, 15% on 6 and 7 or 25% on levels 1 to 5.

The E-1 Extract shade is also designed to add even more variety to the IGORA ROYAL colour palette. It can be used mixed with other shades for an extra portion of cool tone direction or on its own to give you an extra deposit of cool pigments.