Dissolving Difficult Hair Dye (HC Blue 15): Recommended Co-solvents and Method

The difficulty in dissolving HC Blue 15 is common, as this semi-permanent hair dye requires specific conditions. The standard method is to use hot water at 70-80°C.

To significantly improve solubility and ensure a clear solution, we recommend using a co-solvent from the glycol group as a dissolving aid, such as Butylene Glycol (ID: 320) or Propylene Glycol (ID: 138).

Recommended Dissolving Method

1. Pre-mix (Paste): Mix the HC Blue 15 powder with a small amount of Butylene Glycol (or Propylene Glycol) to create a smooth, uniform paste. A ratio of approximately 1 part dye to 3-5 parts glycol is generally effective.
2. Dissolve with Heat: Add the paste to the water phase of your formulation, ensuring the water is heated to 70-80°C.
3. Stir: Stir continuously until the color is completely dissolved and no particles remain. The glycol helps the hot water penetrate and dissolve the dye much more effectively than water alone.
4. Proceed: Once dissolved, you can proceed with the rest of your formulation steps.