Which statement does not apply to developers used during penetrant testing?

In penetrant testing, developers play a critical role in ensuring that indications from flaws or defects are visible. One key aspect of how developers function is by enhancing the visibility of these indications, making them easier for the inspector to detect during the examination process. Developers help to draw out the penetrant from the flaws, thus providing clearer indications.

The statement regarding developers being normally highly fluorescent does not apply, as while some developers may exhibit a certain degree of fluorescence, their primary function is not inherently linked to being fluorescent. Their effectiveness relies more on their ability to enhance visibility and assist with capillary action, rather than on fluorescence itself. Therefore, the emphasis is on the developers’ role in enhancing the visual contrast of the penetrant indications against the test surface.