How long should a newly mixed batch of wet developer stand before use?

The appropriate standing time for a newly mixed batch of wet developer is typically around 4 to 5 hours. This duration allows the developer to properly acquire a uniform consistency and ensures that any settling of particles is adequately resolved. Proper mixing and standing time are crucial for achieving optimal performance during the liquid penetrant testing process, as it impacts the evenness of the developer coating on the test surface. A developer that has not been allowed to stand for the recommended time may not effectively highlight indications, leading to potential oversights in defect detection. Therefore, adhering to the 4 to 5-hour guideline maximizes the efficacy of the wet developer in revealing discontinuities in the material being tested.