Schwarzkopf Professional IGORA ROYAL Oil Developer
Schwarzkopf's Oil Developer is a conditioning, caring peroxide that's optimised to work with new IGORA ROYAL but which can also be used with old-style IGORA if you still have some tubes to use up.
It comes in 4 strengths: 3% (10 vol), 6% (20 vol), 9% (30 vol) and 12% (40 vol). Use them as follows:
Comes in 1-litre bottles.