Whitening Serum Formulation: Silicone/Water Base and 4-butylresorcinol Solubility

Based on the provided formulas for WHITE THERAPY SPOT CORRECTOR and WHITE THERAPY CONCENTRATE-SERUM, the main active ingredients for spot correction and whitening are:

• 4-butylresorcinol: A highly effective skin lightening agent that targets hyperpigmentation.
• Glycyrrhetinic Acid: Known for its anti-inflammatory and soothing properties, it can also help improve skin tone and reduce redness associated with spots.

Regarding your questions:

• Alcohol denat percentage: Alcohol denat helps formulas evaporate quickly, contributing to a lighter feel. The exact percentage needed for fast evaporation depends on the overall formula composition and desired feel. You would typically adjust this percentage during formulation trials to achieve the desired evaporation rate.
• Need for other solvents: As mentioned by the staff previously, 4-butylresorcinol is oil-soluble and requires a suitable solvent or oil phase to dissolve properly in the formula. If your formula does not contain sufficient oil or a solvent capable of dissolving 4-butylresorcinol, it may not be fully effective. The staff suggested using Activated Resorcinol S (Product ID 493) as an alternative if you prefer an oil-free formula, as it is water-soluble. If you are using the standard 4-butylresorcinol, ensure there is an appropriate solvent or oil present to dissolve it.