What is a common feature of antiseptics regarding their application?

Antiseptics are designed to be safe for use on human tissues, which makes their application in medicine and personal hygiene crucial. They help reduce the risk of infection by destroying or inhibiting the growth of pathogens on the skin and mucous membranes. This is why they are commonly used in preparing the skin before surgical procedures or cleaning wounds.

While some antiseptics may not be safe for all types of skin or conditions, in general, the safety of these substances for human use is a fundamental characteristic that sets them apart from disinfectants, which are typically meant for surfaces and not for direct application to living tissues.

The other choices don't align with the primary function and purpose of antiseptics. For instance, while antiseptics can be effective, they do not necessarily kill all forms of microorganisms, as some may be resistant. Additionally, needing specialized training is not a standard requirement for their use in everyday settings.