Igora Vibrance 4-6 Medium Brown Chocolate. With the Igora Vibrance product line, you achieve an ammonia-free, demi-permanent intensive color. The color promises more shine and additional hair protection thanks to the moisture complex enriched with Aquaxyl. With the innovative system, you can choose between a gel or cream activator. The mixing ratio is 1:1. It results in neutral to cool shades with up to 50% gray coverage. The result lasts up to 25 washes. This product is a professional coloring agent and should only be used by those with the necessary expertise.