toc1955's video: Display of nodes and antinodes in Chladni figures

(Adolf Cortel, September 2021). The video shows how to produce Chladni figures displaying both nodes and antinodes in different colors by using a violin bow. The powders used in the video are dyed sand (or glitter) and fine powdered graphite. The bigger particles (sand) gather at the nodes and the smaller ones (graphite) at the antinodes; the result is a beautiful two-color Chladni pattern. For more details and alternatives you can read my article: Adolf Cortel (2021). Nodes and antinodes in two-color Chladni figures. The Physics Teacher 59, pp. 462-3 (2021); https://doi.org/10.1119/10.0006129. I have upload another Youtube video where the figures are produced by a mechanical driver instead of a violin bow.