Aim: To prepare, evaluate and submit vanishing cream.
Requirements: Beaker, Water bath, Stirrer, Suitable container.
Chemicals: Stearic acid, KOH, Glycerin, Perfume, Methylparaben, Propylparaben, Water.
Formulation Consideration: Vanishing cream are designed to spread easily and disappear rapidly when they are rubbed on the skin. It is usually an o/w emulsion. These creams leave a dry tacky residual film. This film also has a drying effect on the skin. Such creams are suitable for hot climates. KOH reacts with stearic acid to give potassium stearate (in-situ soap formation) which acts as an emulgent. KOH neutralizes only 20-30% of the free acid of stearic acid. So that remaining forms a major fraction of the oily phase. When applied to the skin, it disappears since stearic acid melts and re-crystalizes into a gel-like invisible non-greasy layer. Stearic acid also imparts an attractive appearance to the product. Thus cream can be defined as a suspension of stearic acid in a gel of stearate soap (Hydrogel suspension).
Formula:
| Sr.No. | Ingredients | Quantity given | Quantity Taken |
| 1 | Stearic acid | 17 gm | |
| 2 | KOH | 0.7 gm | |
| 3 | Glycerin | 5 gm | |
| 4 | Perfume | q.s. | |
| 5 | Methylparaben | 0.18 gm | |
| 6 | Propylparaben | 0.02 gm | |
| 7 | Water | q.s. to 100 gm |
Procedure:
- Weigh stearic acid and Propylparaben in a beaker. Heat it to 60-70°C.
- Dissolve Methylparaben in boiling water and then dissolve KOH in water in another beaker.
- Add glycerin. Heat it to the same temperature. Add aqueous phase to oily phase with constant stirring.
- Remove the burner. Stir till it comes to 40°C. Add perfume and transfer to a tarred container.
Label: For External Use only.
Storage: Store in a cool and dry place. Keep out of reach of children. Packaging: Packed in a wide-mouth bottle.
Use: Moistens and cleans the skin and also as a makeup remover.
Directions: Apply a thin layer on the face and leave for 2 to 3 minutes and wipe with tissue paper to remove make-up or use as directed by a physician.
Precautions: If irritation persists discontinue use.
Evaluation Table:
| Sr.No. | Test | Observations |
| 1 | Appearance | |
| 2 | Fragrance | |
| 3 | Nature of film | |
| 4 | pH | |
| 5 | Consistency | |
| 6 | Texture | |
| 7 | Type of emulsion | |
| 8 | Spreadability | |
| 9 | Washability Marketed |
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