Kristiansen Illumination

The document describes a novel microscopy technique called Kristiansen illumination that provides high contrast images using a simple compound microscope setup. It involves placing translucent tape on a coverslip above the condenser along with a darkfield filter, which provides oblique illumination and enhances contrast on a grey or blue background. Adjusting the condenser height, diaphragms, and filter type allows further control over the illumination for optimal results.