Magnaflux 20B Fluorescent Magnetic Particle Premixes Highly-sensitive magnetic particle premix powder for locating fine discontinuities in high volume applications, such as forging, casting, stamping, and welding. Easy-to-use premix for making magnetic particle water bath. Provides clear, bright, fluorescent green indications under ultra-violet black light for unbeatable inspection quality and accuracy. Great choice for baths which need to be changed out frequently due to drag-in or heavy-use. Ideal for in-process testing to detect cracks, seams, inclusions, laps, tears, and flakes Pack of 1