Abstract
Synopsis The ideal make-up would be applied in the morning, stay on for the whole day with no noticeable deterioration in spite of heat, moisture and abrasion, and be removed easily at night with normal cleansers. Make-up items based upon pigmented oil-in-water emulsions have poor durability on the skin because the residual oil film is sensitive to body heat and abrasion, and the hydrophilic emulsifier system is sensitive to moisture. The use of volatile solvents in the oil phase together with the adoption of a water-in-oil emulsion system enables much more durable colour effects to be produced on the skin. Stability of the emulsion system is critical and depends on correct choice of emulsifiers, ratio of water to volatile solvent and pigment level. A significant improvement in emulsion stability and durability on the skin was obtained by the inclusion of a new type of aluminium acylate gel. Examples of this emulsion system which have been successfully developed include cream eyeshadow, and tinted foundation.
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