Using guanine micro-crystals with light-reflective surfaces as a fluid tracer, magnetohydrodynamic (MHD) flows were visualized in silver electrodeposition under a magnetic field of 2 T. The trace of a guanine particle showed macroscopic MHD laminar flows at a low deposition current of 50 mu A. On the contrary, at a high current of 200 mu A, the trace exhibited a zigzag walk and vortex motion with the sizes of 100 similar to 500 mu m. This behavior demonstrates the existence of micro-MHD vortices that play a crucial role in chiral surface formation. (C) The Author(s) 2017. Published by ECS. All rights reserved.