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NO...What would be the purpose? Developer is just an activator for color or bleach.
A color developer, whether it's cream or clear, acts as an activator with color, which is mixed together. It opens the cuticle of the hair shaft so that the color can be deposited. It will lift your natural color up a shade or two depending on the volume of the developer used.
The ratio is 1:1. So, 1oz of developer to 1oz of color.
Mix equal parts of developer and Wella color.
1:1
it is the activator device
1:1 1:1 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.
A creme developer is used on the hair to help lift and tone the color. The developer will speed up the lightening process of the hair and is typically used when bleaching or highlighting the hair.
difference between activator and inhibitor
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.