Soap technology — role of sulphur in medicated soaps In specialty “sulphur soaps,” the intentional addition of sulphur serves primarily which purpose for consumers?

Introduction / Context:
Sulphur has been used for decades in over-the-counter dermatologic products. When incorporated into soap bars at appropriate levels, it provides specific skin and scalp benefits beyond simple cleansing.

Given Data / Assumptions:

• “Sulphur soap” refers to a bar containing elemental sulphur or sulphur-containing actives.
• Dermatologic indications include acne (pimples) and seborrheic dermatitis/dandruff.

Concept / Approach:
Sulphur exhibits mild keratolytic and antimicrobial properties. It can reduce Propionibacterium (Cutibacterium) acnes on skin and help manage Malassezia-related dandruff on the scalp, complementing surfactant cleansing. It does not change core foam kinetics or base surfactant detergency in a fundamental way.

Step-by-Step Solution:
Identify pharmacologic action: keratolytic + antimicrobial.Match to consumer benefit: managing acne and dandruff.Therefore, the primary purpose is therapeutic benefit, not lather rate or base detergency.

Verification / Alternative check:
Labeling and pharmacopeial monographs list sulphur soaps among medicated products for acne and dandruff control.

Why Other Options Are Wrong:

• Texture and foam rate are formulation-dependent but not the core reason for adding sulphur.
• Increasing base detergency is achieved by surfactant selection, not sulphur.

Common Pitfalls:

• Assuming any additive improves cleaning; sulphur’s role is therapeutic/antimicrobial.

Final Answer:
Help in treating pimples and dandruff (antimicrobial/keratolytic action)