MG-601 is a high-sensitivity fluorescent magnetic particle powder concentrate designed for wet method magnetic particle inspection (MPI). It produces bright yellow-green indications under UV light, enabling the detection of very fine to fine surface and slightly subsurface discontinuities in ferrous materials. MG-601 is formulated to be used as a top-up for MF-655 WB ink concentrate, enhancing the sensitivity and performance of the magnetic particle system.