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talc(talk) a native hydrous magnesium silicate, sometimes with a small amount of aluminum silicate; in purified form, used as a dusting powder and pharmaceutic aid.
talcA dry lubricant used in products that may contact mucocutaneous surfaces–eg, condoms, dental dams, and non-surgical latex gloves; talc was banned from surgical gloves in 1991 by the FDA
talc; talcum finely powdered hydrous magnesium silicate; used as a base for topical application of an active medicament; reduces friction at skin surface; does not absorb moisture (see Table 1 and Table 2)
|Alcohol||IMS; 70% isopropyl alcohol; spirituous lotions, e.g. 3% salicylic acid in IMS; surgical spirit; evaporates to cool skin and reduce maceration|
|Formalin||10% solution causes a toughening effect on epidermis (may cause hypersensitivity)|
|AgNO3||20-25% solution (higher strengths can be used as NaCl in sweat mitigates the action of AgNO3)|
|Tannic acid||As dusting powder, or as borotannic complex giving an antifungal action|
|Hamamelis||Witch hazel: cooling effect|
|Calamine||Lotion or cream with a mild astringent and absorbent action; it will take up 1.5 times its own weight of water|
|Salicylic acid 3%||Astringent and antiseptic as a lotion or dusting powder|
|Burow's solution||Aluminium acetate ∼5% solution; diluted 1:3 in water to reduce sweat flow|
|Talc||Antipruritic and absorbent; used as a base for dusting powders and to lubricate the skin|
|Dusting powders||Astringent medicament (e.g. tannic acid, salicylic acid), or antifungal medicament (e.g. boric acid, undecenoic acid) and lubricating applications in a talc, kaolin and/or zinc oxide base|
|Others||Agents that coincidentally show astringent/anhidrotic action include potassium permanganate, sodium polymetaphosphate, ferric chloride and compound tincture of benzoin|
Note: Astringents act variously to cause protein precipitation (and thereby reduce epidermal maceration), cooling of tissues, constriction of sweat ducts and skin lubrication); anhidrotics act variously as cooling agents, astringents, and to alter epidermal reaction to retained sweat (e.g. reduce friction at the skin surface).
Both are used to control hyperhidrosis and bromidrosis by preventing the accumulation of sweat, increasing the skin's reaction to the action of sweat, and to compensate for any loss of resistance to infection at the skin surface.
IMS, industrial methylated spirit.
|Starch, Chalk, Magnesium carbonate, Kaolin, Talc, Zinc oxide, Zinc stearate The base agent should augment the action of the active ingredient|
|Boric acid 5%|
Salicylic acid 3-10%
Alum 10% Benzocaine 10%
Sodium perborate 15%
Sodium poly-metaphosphate 5%
Undecenoic acid 2%
Zinc undecenoate 10%
|Active against foetid bacteria|
Astringent, antiseptic, antifungal
Strongly astringent and deodorant
Analgesic and antipruritic
Antipruritic and fungicidal
Hyperhidrosis and mild fungal skin infection
Hyperhidrosis and bromidrosis
Irritant skin conditions
Irritant skin conditions
Irritant fungal infections
Mild skin infection
Prophylaxis of fungal infection