Adding Ingredients to Your Toner

Based on the ingredients in your current toner and the properties of the ingredients you wish to add, here's an assessment of compatibility:

• Ume Extract: This ingredient is water-soluble and can likely be added to your toner base. However, it is sensitive to heat above 40°C, so if your toner was made using heat, the Ume Extract should be added after it has cooled down. The optimal pH range for Ume Extract is 4.0-6.5, which should be considered.

• Activated Resorcinol​™: This ingredient is oil-soluble. Your toner is primarily water-based, although it contains some ingredients like Polysorbate 20 that can help with solubilization. Effectively incorporating Activated Resorcinol​™ into this base might be challenging without an additional solubilizer or emulsifier designed for oil-soluble ingredients in a water base. The optimal pH for Activated Resorcinol​™ is 4.5-5.5, which overlaps with Ume Extract's range but requires careful pH adjustment.

• MSH White​™: This ingredient is soluble in oil, alcohol (at least 60°C), or at a high pH (>8). Your toner base is not ideal for dissolving MSH White​™ as it is water-based, likely doesn't contain significant alcohol, and is unlikely to have a high pH suitable for skin. Incorporating this would also likely require a suitable solubilizer or co-solvent.

• Reservoir-Tech: This ingredient is dispersible in formulas but not soluble in water or oil. It is designed to help retain and gradually release active ingredients, particularly water-soluble ones and some listed oil-soluble ones (though Activated Resorcinol​™ and MSH White​™ are not explicitly listed). It can likely be incorporated into your toner base by blending, and it might help with the delivery of other ingredients, but its effectiveness with Activated Resorcinol​™ and MSH White​™ in this specific formula would need testing.

Summary of Challenges:
The main challenge in adding Activated Resorcinol​™ and MSH White​™ to your existing toner is their limited solubility in a water-based system. While Ume Extract and Reservoir-Tech are more compatible with the base, achieving a stable and effective formulation with all four added ingredients, especially Activated Resorcinol​™ and MSH White​™, would require careful formulation work, potentially including the use of appropriate solubilizers and pH adjustment to be within the optimal range for Activated Resorcinol​™ (4.5-5.5) and Ume Extract (4.0-6.5).

It is recommended to perform small-scale tests to check for solubility, stability (no separation or precipitation), and pH compatibility before making a larger batch.