How to use D&C Red 27 Color Changing Pigment (CI45410): Solubility in water vs oil
คำถาม
Could you please provide detailed instructions on how to use `D&C Red 27 Color Changing Pigment (CI45410)`?
I've tried adjusting the pH of water and adding the color, but the color does not dissolve, forming clumps and floating on the water surface.
คำตอบ
How to Use D&C Red 27 Color Changing Pigment (CI45410)
Based on the product information, D&C Red 27 Color Changing Pigment (CI45410) is designed to change color with pH. However, the reason you are having trouble dissolving it in water is that this pigment is primarily soluble in oil, not water.
It is specifically recommended for use in anhydrous (water-free) formulations, such as anhydrous gels. When dissolved in oil, it typically appears as a light orange color. Upon contact with the skin (which has a different pH/moisture), it changes to a pink color.
Detailed Usage Instructions:
- Dissolve in Oil: The correct way to incorporate this pigment is to dissolve it completely in a suitable oil or oil phase of your formulation.
- Formulation Type: It is highly recommended to use this pigment in anhydrous formulations (formulas without water) to ensure the color change effect occurs upon contact with the skin.
- Usage Rate: Use at a concentration of 0.1% to 3%, depending on the desired color intensity.
Therefore, trying to dissolve it directly in water or adjusting the water's pH will not work effectively because it requires dissolution in oil and is intended for water-free systems.
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