Water-Soluble Red Colors: Understanding the Differences and Usage

When looking at water-soluble red colors, you might see different names like "Red Powder" and "D&C Red colors." While both provide red hues and are water-soluble, the key differences lie in their specific chemical composition and regulatory certifications.

• D&C and FD&C Colors: These designations, such as D&C Red No. 33 or FD&C Red No. 40, indicate that the colorant has been certified by regulatory bodies in the United States (like the FDA) for use in drugs and cosmetics (D&C) or food, drugs, and cosmetics (FD&C). They are specific synthetic colorants identified by a unique "Color Index" (CI) number (e.g., CI 17200 for D&C Red No. 33, CI 16035 for FD&C Red No. 40). Each number corresponds to a particular chemical structure with specific properties and approved uses.
• "Red Powder" (without D&C/FD&C): A product simply labeled "Red Powder" (Water-Soluble) like the one with CI 16255 and CI 14720 is also a water-soluble cosmetic colorant. It is also licensed for use under USA and European standards, indicated by its CI numbers. The difference in naming might relate to it being a blend of colorants or a different type of red pigment not specifically designated with a D&C or FD&C number, but still approved for cosmetic use based on its CI composition.

In essence, D&C and FD&C names refer to specific, certified synthetic colorants widely recognized and approved for cosmetic use, identified by their unique numbers and CI codes. Other "Red Powder" water-soluble colors are also approved cosmetic colorants, identified by their CI numbers, but may not fall under the specific D&C/FD&C naming convention.

Regarding your second question, dissolving water-soluble colors in water and adding a preservative is the correct method. Water-soluble colors are designed to be mixed into the water phase of a formulation. Adding a preservative to this solution, especially if preparing a stock solution or incorporating it into a water-containing product, is crucial to prevent microbial growth and maintain the stability and safety of your formulation.