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.
Comments
do you mean a product that exists as two separate liquids inside the bottle, and that you shake before use, e.g. Dentyl pH mouthwash?
or do you mean something like striped toothpaste?
http://www.directcosmetics.com/icode/59218
I'm not sure how it is done but it is very clever.
http://www.garnierusa.com/products/skincare/ultra-lift/face-serums/ultra-lift-2in1-serum-plus-moisturizer.aspx
http://www.indianbeautyhub.com/new-launch-garnier-white-complete-double-action-face-wash/
I had a request for a five layer product to compete but the best we could manage was four - and we weren't able to get a good enough colour difference between the layers.
The layers comprised water bottom layer, light mineral oil for the middle and the top layer was a volatile silicone (cyclopentasiloxane). The colour was water soluble for the lower layer and oil (or rather silicone) soluble. By careful selection of colours there was a three colour system with the middle layer a combination of the upper and lower layers.
Looked spectacular, especially after shaking and allowing to separate again but, as said above, totally useless.