if your using professional product all schwarzkopf igora royal (permanent ) colours are mixed on a 1 to 1 ratio
Mix equal parts of developer and Wella color.
The ratio is 1:1. So, 1oz of developer to 1oz of color.
1:1
1:1
In this situation, the 2:1 ratio is two parts developer and one part color. For example, mix 4 ounces of developer and 2 ounces of color.
1:1 for Paul Mitchell permanent color its 1 oz color to q oz developer.
While it's best to mix Redken Color Fusion with their Pro-Oxide Cream Developer, it will be fine to mix a Sally brand instead. Color Fusion is 1:1 Ratio and Double Fusion is 1:2 Ratio.
I believe 1.5 parts would be 1.5 ounces of developer to 4 ounces of color, which doesn't seem like enough developer. Double check the directions. Usually haircolor is either 1:1 or 1:2 ratio. I've never heard of 4:1.5 ratio.
The volume of the developer simply tells you how many levels it will lift your hair so since you are using 30 volume, it will lift your natural color 3 levels higher to help the permanent color show better. The volume/color ratio is 1:1 which means however many oz. of haircolor you use, you put the same number of oz of developer. For example: 2oz permanent haircolor: 2oz of developer I hope this helps you! Source: I am a cosmetologist
generally the ratio is 2 oz per 2 oz (in other words 2 oz of developer to 2 oz of color) the 20, 30, 40 indicates the strenghth of the lift
Usually the ratio of mixing peroxide to hair color is 1:1, or equal parts. Occasionally it's 1:2, one part color and 2 parts developer...depending upon the color line. This is why it's very important to read the manufacturer's instructions or seek help from a professional hairstylist.
1:1 1:1 1:1