Do it yourself Van Dyke kit.
Create sepia prints using an analog photographic process from the 19th century. No darkroom required, just this kit and some sunlight!
With the ingredients in this kit, you can transform watercolor paper into photo paper by making it UV-sensitive. Where the sun hits the treated paper, a dark brown color develops, also known as a sepia tone. This way, you can create brown-and-white prints at home. For example, you can print a photo on a sheet, draw on a sheet, or collect objects to place on the treated paper. Briefly expose it to the sun and you'll see the color change! With this kit, you can mix and apply the photo chemicals yourself, enough for approximately 25 A4 sheets. So you can make enough mix to experiment further.
Instructions in the kit are in Dutch, English, French and German.