... removing the lather, use a sponge and warm vinegar or weak acid (see Acetic Acid), and dry gently with a soft towel. This application can be used with good effect in all cases of hard, dry skin on the head, and formation of white scurf. It preserves the hair, and stimulates its growth. It also removes the painful sensitiveness to touch so often felt in the hair and head skin. Care must ever be taken to do it all with a gentle hand. So done it is priceless in its soothing and ... — Papers on Health • John Kirk
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