Figure 6. Comparison of the gas evolution between an electrochemically treated (A left, B) and an untreated gold wire (A right, C).

From

Electrochemical Synthesis of Coin Metal Nanoparticles in School Chemistry Education

Elena von Hoff, Stefanie Waitz, Felix Kollenda, Thomas Waitz

World Journal of Chemical Education. 2018, 6(1), 72-77 doi:10.12691/wjce-6-1-11