Formulation of Lipstick
Evaluation of Lipstick
- Droop point test: The temperature at which lipstick starts leaking oil or flattens is known as droop point.
- Breaking point test: This test is employed for assessing the strength of the lipstick. Lipstick is held horizontally and weight is applied. The weight at which it breaks is termed as breaking point of the lipstick.
- Test for penetrability: Indicates the rheological property of the lipstick. A needle of specific diameter is allowed to penetrate the lipstick and depth of penetration is noted.
- Test for force of application: Lipstick is applied on the piece of paper at an angle of 450 and the force required for applying is read from the balance.
- Stability test: Stability of lipstick can be determined by means of accelerated stability test.
Formulation related problems in lipstick:
- Sweating: Increased oil content.
- Bleeding: Separation of coloured liquid.
- Blooming: Surface appeared dull (Increased amount of cetyl alcohol)
- Streaking: Thin lines or band of colours due to floatation of oil particles in TiO2.
- Seams: Marks left on the lipstick when split moulds are used.
Formulations of Shampoos
- Fat: fatty alcohols, sterols, fatty acids, glycerides.
- Silicones: Dimethicone, dimecopolyol
- Hydrolysed proteins
Formulation of nail preparations
Formulation of dentrifrices
Formulation of creams
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