When we all line up and make our Oil Bleach Kits we are making a zillion and one of them. At one point we decided to test iweighed 4 ounces of developer versus 4oz, weigh in a measuring cup. It really is pretty far off. But we send those measuring cups for those who are going to just 'guess'. What we discovered is 4oz. measured in the Cup is 3.6 ounces on the scale. So if you absolutely refuse to get a scale you can make thaty adjustment on your own. The color has been tested over and over at the ratio they give you.
For example in Wella:
- Color Touch Demi-Permanent is 1:2
- Koleston Perfect - Permanent, is 1:1.. although all Level 11 & 12 colors are 1:2
- Illumina is 1:1.5
Schwarzkopf, the line has the most beautiful colors I have seen in many years, their ratio is 1: 1 and I find many people don't use that ratio which will not let the color do what it was designed to do.
When using Highlift Level 12 Colors use "double 40" or for every 1 ounce of color you need to use 2 ounces of 40 Volume Or it won't lift high enough.