Developers in penetrant testing are NOT used for which of the following functions?

In penetrant testing, the primary functions of developers are to enhance the visibility of indications, absorb penetrant, and create a clear background for inspection. These roles are crucial in ensuring that any defects in the tested material become visible after the penetrant has been applied.

The addition of fluorescence to penetrants is not a function of developers. Fluorescence is a property of some penetrant materials themselves, which allow defects to be detected under ultraviolet light. The role of developers comes into play after the penetrant has been applied and penetrated into any flaws. Developers help to draw the penetrant out of these flaws, allowing for the detection of defects.

In this context, the focus of developers is more on enhancing the effectiveness and clarity of the inspection process rather than altering the penetrant's properties. Therefore, choosing a function associated with a developer that involves adding fluorescence to penetrants is incorrect, as that characteristic is inherent to the penetrant materials themselves, not a role played by developers.