Final answer:
Fluorescent powder is suitable for developing a print on surfaces that are obscured by their color when UV light is used. It adheres well to surfaces and glows under UV light, making it valuable for forensic investigations.
Step-by-step explanation:
When the color of a surface obscures a print ande UV light is necessary for developing, a fluorescent powder is an appropriate choice. This type of powder, when mixed with an adhesive to form a paste, can be applied to a surface and will give off a bright glow under UV light. This becomes particularly useful in forensic applications where it is essential to see the print against a background that otherwise conceals it. Additionally, conservation efforts for artworks and colored prints usually prohibit flash photography with UV light that can cause photo-degradation. Therefore, a protective measure, like an extra-thick layer of glass, is often placed in front of precious pieces to absorb harmful UV radiation.