Adding Water and Oil to Sleeping Mask Bases

Based on the product descriptions:

Cica Sleeping Mask Base (compare to Laneige)

• This base can accommodate a maximum increase of 10% of oil or silicone. The description does not specify a limit for adding water.
• The base is preservative-free.

Water Sleeping Mask Base (compare to Laneige)

• The description for this base does not specify a maximum percentage for adding either water or oil/silicone.
• The base is preservative-free.

Preservatives

Both the Cica Sleeping Mask Base and the Water Sleeping Mask Base are preservative-free. If you add water to either of these bases, it is essential to add a suitable broad-spectrum preservative to prevent microbial growth and ensure the stability and safety of the product. Adding oil might also require consideration depending on the type of oil and the overall formula.

The product descriptions do not recommend specific preservatives or the required dosage. The choice and amount of preservative needed will depend on the total percentage of water added, the specific ingredients you add, and the desired shelf life and stability of the final product. It is recommended to use a broad-spectrum preservative system effective against bacteria, yeast, and mold.

For precise guidance on which preservative to use and at what concentration for your specific formulation, it is best to consult a formulation expert or refer to the technical documentation for the preservative ingredients you are considering.