Emulsifying Water/Oil Mixture and Choosing Non-Staining Colorant for Cream
คำถาม
I have two questions:
- Regarding mixing a solution containing 35% water and 50% water-soluble liquid extract with 15% oil, can this mixture be blended into a homogeneous consistency?
- Could you please recommend a colorant for cream (which may be mixed with foundation) that only colors the cream itself and does not transfer color to the skin when applied? I want the cream to have the desired color without affecting the color of the foundation mixed into it.
คำตอบ
Emulsifying Solutions and Choosing Colorants for Cream
Here are the answers to your questions:
1. Blending Water Solution, Water-Soluble Extract, and Oil
Regarding blending a mixture of 35% water, 50% water-soluble liquid extract, and 15% oil, it is difficult to achieve a permanently homogeneous mixture without an emulsifier.
Water-based components (water + water-soluble extract, totaling 85%) and oil (15%) are naturally immiscible. They will separate into distinct layers when left standing. Even high-speed blending might only temporarily combine them; they will likely separate again over time.
To make these components combine into a stable, homogeneous mixture (an emulsion), you need to add an Emulsifier to the formula. An emulsifier acts as a bridge between the water and oil phases, helping to create a stable emulsion.
2. Choosing a Colorant for Cream That Doesn't Stain Skin
For selecting a colorant that colors the cream itself but does not stain or transfer color to the skin upon application, and does not affect the color of foundation mixed into the cream, it is recommended to use Pigments (insoluble color powders).
Pigments are small particles that disperse within the cream base; they do not dissolve into the cream. When applied to the skin, these pigments remain within the cream matrix and do not absorb into or react with the skin, thus preventing color transfer or staining and not interfering with the color of any mixed-in foundation.
Based on the search results, certain pigments are suitable, such as Fluorescent Magenta Pigment. This is a pigment powder that disperses well in various formulations and is suitable for coloring the product itself without dissolving or staining the skin like dyes would.
When using pigments in cream, you need to ensure the powder is evenly dispersed throughout the cream using appropriate blending methods, possibly requiring a suitable mixing head to ensure the pigment is well-distributed and does not clump.
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