Which of the following substances can undergo flash curing?

Flash curing refers to a quick curing process typically used in nail technology, primarily associated with UV gels. This technique involves exposing the gel product to UV light for a very short period, allowing the surface to set quickly while the underlying layers remain uncured. This is particularly useful in nail enhancement services, as it allows nail technicians to work with multiple layers of product without complete curing until the final application is completed.

UV gel formulas are specifically designed to react to UV light. During flash curing, the outer layer hardens while maintaining the workability of the inner layers. This property makes UV gels the most suitable candidate for flash curing among the options provided.

In contrast, gel polish, acrylic, and silk wraps do not typically utilize flash curing in the same manner. Gel polish is usually cured continuously under a UV or LED lamp after each layer. Acrylic requires a chemical reaction to harden and does not cure via light. Silk wraps are applied with a resin that needs time to set, rather than through an immediate light-curing process. Thus, the ability of UV gel to undergo flash curing is what designates it as the correct answer.