What is NOT a property of a developer used in liquid penetrant testing?

In liquid penetrant testing, developers play a crucial role in revealing defects in materials. The correct property that does not apply to developers is that they are fluorescent when used with fluorescent penetrants. While fluorescent penetrants indeed glow under ultraviolet light, the developer itself typically does not exhibit fluorescence. Its primary function is to create a contrast against the fluorescent indications left by penetrants, thus making any defects visible.

The other properties mentioned are relevant to the function of a developer. For example, low absorption is essential as the developer should not absorb the penetrant excessively; this allows the developer to effectively draw penetrant out of defects. Additionally, a developer may have pores to facilitate the evaporation of penetrant, enabling the visibility of the defects without interference from a residual penetrant that might obscure the flaw. These characteristics are vital for the successful application of liquid penetrant testing and help ensure accurate flaw detection.