Topic: Looking at blood with bright field, dark field and phase contrast. You can see the red blood cells (erythrocytes) quite well. I bumped my head on the corner of the car door unloading some shopping.
Here is a large image of a dandelion seed. Happy exploring!
Darkfield microscopy is one of the simplest and cheapest contrast enhancing techniques. It works well for specimens that have a refractive index which is different from its surrounding medium, but which are difficult to see because they lack color. Dark field microscopy shows the specimen bright on a dark background.