Colorants for Grey Hair Darkening Shampoo

The colorants typically used in shampoo and conditioner formulas, especially for semi-permanent color or gradually darkening hair like grey hair darkening shampoo, are Direct Dyes or Basic Dyes. These dyes deposit color directly onto the hair surface without requiring a developer.

When using these colorants from MySkinRecipes in your grey hair darkening shampoo formula, consider the following:

• Solubility: These colorants are typically in powder form and need to be dissolved in hot water (70-80°C) before being added to your shampoo base.
• Compatibility with Surfactants: Direct and Basic Dyes are positively charged. They are not compatible with negatively charged (anionic) surfactants commonly found in many shampoos. It is recommended to use non-ionic surfactants (like Lauryl Glucoside, Coco Glucoside) or amphoteric surfactants (like Coco-Foam™) in your formula to ensure the color adheres well and doesn't precipitate.
• Electrolytes/Salts: Avoid adding salts or electrolytes to the formula, as they can negatively affect color longevity.
• pH Level: Color adhesion is better in a more alkaline formula, as it helps open the hair cuticles. Aim for a pH around 9. However, do not exceed pH 9, as this can cause the colorants to decompose.
• ColorFix™: To help the color adhere better and last longer, it is highly recommended to include ColorFix™ in your formula. The suggested usage rate for shampoo is 0.6%.

In summary, you can incorporate these colorants into your shampoo formula, but they must be dissolved first, and you need to ensure compatibility with other ingredients, particularly the surfactants and pH level, and consider using ColorFix™ for enhanced performance.