Dual layer cosmetic product
I am thinking to develop a dual layer cosmetic product (cream, lotion or face cleanser or other suitable category). If anybody is having an experience or any suggestion related to it, please share & i would like to mention here that i have done literature survey for this but unfortunately i didn’t find much useful info even though there is not much market presence of such products. I also have a question that :
1. Which kind of chemistry does behind such a dual layer technology?
2. Is it a difference between specific gravity of each layer or related to miscibility?
3. Is it a role of filling technique of such a product behind it?
Note - Dual layer cosmetic means, product should discharge from nozzle of the tube in two colors or one layer should be transparent & other creamy like.