What is the main result of UVA light on melanin production?

The correct response highlights that UVA light primarily causes existing melanin to darken rather than stimulating the production of new melanin. When skin is exposed to UVA rays, which penetrate deeply into the skin, the existing melanin undergoes a process called oxidation. This results in the darkening of the pigment, which contributes to the tanned appearance.

UVA rays can also lead to longer-term changes in the skin, but their immediate effect is to enhance the color of existing melanin rather than create new pigment. This process is significant because it informs individuals about how tanning works and the role of different types of UV light in melanin's behavior. Understanding this mechanism is critical for anyone involved in tanning services, ensuring that clients are well-informed about how they can achieve their desired skin tone safely.