The first video shows what happens when copper wire and silver nitrate are allowed to react under the microscope. The video was recorded using Gladys, the Zeiss universal with transmitted light. Because the silver formed is not transparent it appears in silhouette. The pink background was achieved using a rheinberg filter.
The second video shows the same reaction viewed under a stereomicroscope using incident light. The magnification is not as great using the stereomicroscope but it is fun to see how the different types of microscope give a different perspective on the same reaction.