The Igora Vibrance Activator Gel 1.9 % by Schwarzkopf Professional is a gel developer that can be mixed with the Igora Vibrance Tone-on-Tone hair colours. It forms a unique gel consistency for quick and easy application. Application: Mixing ratio: 1:1. Apply the formula to dry hair according to the instructions. Leave it on for 5 - 20 minutes. T981B.