Liquid Penetrant Testing Level 1 (PT-1) Practice Exam

Which of the following is not a property of a developer used in liquid penetrant dye testing?

1. The material must be fluorescent if used with fluorescent penetrants

2. Must absorb the penetrant effectively

3. Should have a fine particle size

4. Must be non-reactive with the penetrant

The correct answer is: The material must be fluorescent if used with fluorescent penetrants

The characteristic of a developer in liquid penetrant testing is that it must have specific properties to effectively reveal any flaws or discontinuities in the test material. The correct focus in this context is on the developmental function itself. A developer should indeed have the ability to absorb the penetrant effectively to draw it back to the surface for visibility. It is also critical that the developer possesses a fine particle size, as this helps to create a good contrast and facilitate the visualization of the indication. Additionally, being non-reactive with the penetrant is essential to prevent any interference that might affect the reliability of the test results. While fluorescent developers are beneficial when used with fluorescent penetrants to enhance the contrast of indications, it is not an absolute requirement for a developer. Non-fluorescent developers can still be highly effective when used with non-fluorescent penetrants. Thus, the assertion that the material must be fluorescent if used with fluorescent penetrants is not universally applicable and is the reason this answer aligns with the context of the question regarding what is not a property of a developer used in liquid penetrant dye testing.