In essence, cyanotypes are blueprints that were used by engineers for many years. At the time, they were considered a quick and easy way to re-create drawings.

Today, they’re often used to create haunting photos with a blue tint.

There are several versions of cyanotype. The most common one doesn’t require a camera at all. The other requires digital negatives.

First, you need to coat a sheet of paper (some people use watercolor paper) with ferric ammonium citrate and potassium ferricyanide. This combination of chemicals results in a faded yellow color.

You can then cover the paper with a printed digital negative or objects. Many artists use plants.

The prints are then exposed to ultraviolet light. Some people use professional machines, car lights, or normal daylight for this step.

Once the print starts to turn green or blue, you can wash it. The parts that were covered will appear white, and everything surrounding them will have a beautiful blue tint.

https://digital-photography-school.com/megapost-learning-how-to-use-your-first-dslr/

UK, contemporary, photographs banal objects encontered on the street, slightly manipulating the scene sometime, placing objects to create humour or irony.