Burrow's solution (aluminum acetate) and limewater have which of the listed properties?

• A. Emollients
• B. Antiseptics
• C. Astringents
• D. Anesthetics

Answer: (C)

Astringents cause contraction of tissues and precipitation of proteins on the surface, which dries and tightens the tissues and reduces secretions. Burrow's solution (aluminum acetate) works by causing protein coagulation on irritated skin, forming a protective, drying layer that shrinks channels and reduces discharge. Limewater (calcium hydroxide in water) has a similar drying, tissue-tightening effect by coagulating surface proteins. Because both produce a drying, contracting action on tissues, they are best described as astringents. They are not primarily emollients (which soften or moisturize), not true antiseptics, and not anesthetics.