Which powder is known for soothing surface blood capillaries and is suitable for sensitive skin?

Calamine powder is widely recognized for its soothing properties, especially for sensitive skin. It contains a combination of zinc oxide and iron oxide, which work together to not only calm irritation but also reduce redness associated with inflamed surface blood capillaries. This makes it particularly effective for those who experience sensitivity or allergic reactions, as it helps to provide a cooling effect and promote healing.

In contrast, Fuller's earth is primarily used for its oil-absorbing and exfoliating properties and may not provide the soothing benefits that sensitive skin requires. Magnesium carbonate is often used in cosmetic formulations for its absorbent qualities but lacks the specific soothing elements that calamine offers. Flowers of sulphur, while utilized for its antimicrobial properties, can be too harsh for sensitive skin and is generally used in treatments for specific skin conditions like acne rather than as a soothing agent.

Thus, calamine is the most suitable choice for calming and soothing sensitive skin due to its gentle and restorative nature.