Check the listing for details. Schwarzkopf Igora Royal Oil Developer 6% 20 Volume, 2 oz. Color: N/A, Condition: New with box. Listed at 6.99 USD. Schwarzkopf Igora Royal Oil Developer 6% 20 Volume, 2 oz Schwarzkopf Igora Royal Oil Developer 6% 20 Vol. 60ml (2.02 fl oz) is an oil-based activating formula that promises to deliver optimal results, each time. Specially developed to use in combination with the dying solutions of the Schwarzkopf Igora collection, this product ensures professional and long-lasting results while minimizing damage. In fact, at the same time that this composition extends color durability, it also focuses on nourishing and caring for the strands with its oily agents. Even more, the Schwarzkopf Igora Royal Oil Developer fortifies the hair fiber and contributes to intense and radiant shades. Last but not least, this developer helps you cover up to 100% of white hair. The result? Soft and strong strands that display vibrant and long-lasting color. How to use: This product was developed for professional use only and should not, therefore, be used at home. Mix Schwarzkopf Igora Royal Oil Developer 6% 20 Vol. 60ml (2.02 fl oz) with one of the dyes from the Schwarzkopf Igora collection, using the right ratio.