Preparation of Lipsticks

PREPARATION OF LIPSTICKS

Successful preparation of lipstick shades depend upon the adequate dispersion of the lake colours in the lipstick mass. It is advisable to prepare the dispersion of lake colours in castor oil. Dispersions are generally prepared by milling about 25% concentrations of lakes in castor oil.

Method Of Preparation:

If a solvent is used for the dissolution of bromo acid, the solution is first prepared and set aside until required.

If commercial colour pastes are not being used, then lake colours are first dispersed by mixing with suitable quantity of castor oil.

The colour paste obtained is passed through a triple roller mill until it becomes smooth and free from agglomerates and gritty particles.

The colour mixture is then mixed with the bromo acid mixture.

All the ingredients of the base are identified and arranged in the increasing order of their melting points.

This mixture is remilled until it is perfectly smooth.

Preservatives and anti-oxidant are dissolved in remaining oil and are added to the mixture.

Finally, the perfume is added and the mass is stirred thoroughly, but gently to avoid entrapment of air.

Automatic ejection mould is preferred for the large scale production.

The mould is lubricated with liquid paraffin or isopropyl myristate before pouring the mass into the mould.

It is important to prevent settling down of the coloring mass when the moulds are chilled. Lubrication facilitates easy removal of sticks.