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Iodine is commonly used as an antiseptic for skin preparation due to its broad-spectrum antimicrobial properties. It effectively kills a wide range of microorganisms including bacteria, viruses, and fungi, making it suitable for disinfecting the skin before procedures such as venipuncture or surgery. Additionally, iodine solutions can provide a residual effect, continuing to inhibit microbial growth after application.

While other substances listed have antiseptic properties, they differ in usage and effectiveness. Alcohol is often used as a quick-drying agent that can also disinfect the skin, but it may not provide the same longevity of antimicrobial activity as iodine. Chlorhexidine is another effective antiseptic, favored in some settings for its residual effects, but it may not be as universally applied as iodine for all skin prep needs. Hydrogen peroxide is generally used as a disinfectant but may not be suitable for skin preparation because it can be irritating and may not have the same broad-spectrum efficacy on skin as iodine solutions.

Overall, the properties of iodine make it a preferred choice in various medical and clinical settings for skin antisepsis.