In the context of this cosmetic ingredient, 'keratoplastic character' refers to a traditional property ascribed to birch tar that helps soften and loosen rough surface build-up on the skin or scalp. This is a cosmetic effect, not a medical treatment. Practically, this means when incorporated into formulas like cleansers or shampoos, it may help make hardened or flaky areas feel smoother and less uneven over time with consistent, occasional use.
For the scalp, this action is often why birch tar is chosen for oily scalp formulas and tar-based shampoos, as it can help address the feeling of buildup or thickness. For body skin, particularly on areas like elbows, knees, or feet that can develop rough, dry patches, this property contributes to its use in cleansing bars or richer body products. It works by gently affecting the outermost layer of skin cells, encouraging a softer, more pliable surface texture. It does not exfoliate in an abrasive way but is considered a functional, traditional cosmetic ingredient for areas that need a more intensive protective layer. The effect is supportive and part of a broader care routine, not a standalone solution for specific skin conditions.