Pastes definition and it's despencing procedure

Definition: pastes Pastes may be defined as the semi-solid preparations ment for external application onto skin to form a protective coating over the skin. Pastes are less greasy when compared to ointments but very thick and stiff because of their high solid content. Preparation : pastes are prepared by irritation and fusion method, which are same as used in the preparation of ointments. 1.Trituration method : The trituration method is used when the base is soft and the solid medicament is insoluble in the base. The method may be as follows, 1.Accurately weigh the required amount of the solid medicament and finely powder it. Also weigh the amount of base. 2.triturate the solid medicament in small amount of base with a spatula on a plain slab, until a uniform and homogeneous product is formed. 3.mix the remaini...