V. PAINTS AND PENCILS
Paints or pigments are liquids, usually containing highly active ingredients, intended to be painted on the surface. They generally are solutions or suspensions in water, volatile organic solvents, glycerin, or oil. Glycerin is the best vehicle for applications to mucous membranes or raw surfaces, when more prolonged action is desired. For application to the intact skin, volatile organic solvents, such as alcohol, ether or chloroform, are generally preferred. When prolonged action on the skin is aimed at, a substance that leaves a film is added.One of the chief uses of pigments is for the production of hyperemia. They are also sometimes used as analgesics in neuralgia. Occasionally they are employed for effect on diseased skin, rarely for diadermic action.The difference between the indications for counter-irritation by means of pigments and of liniments is largely equivalent to the contraindications and indications for massage, and centers
FANTUS B. THE TECHNIC OF MEDICATION: A SERIES OF ARTICLES ON THE METHODS OF PRESCRIBING AND PREPARING, THE INDICATIONS FOR, AND THE USES OF VARIOUS MEDICAMENTS. JAMA. 1926;86(5):347–349. doi:10.1001/jama.1926.26720310002010
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