Hidden sadface in embryonic fluid sample, circa 1890.
Photogram made on Agfa FB paper.

The first post from a set of images made by placing old microscope slides into the enlarger neg carrier. Slides are all late 19th/early 20th century and have not been cleaned up. They are approximately one century dirty ;-)

Unidentified weeds taken from waste ground
Positive & Negative
Kentmere Paper, 5 minute exposure under UV unit - yes the nights are drawing in :(

Honesty (Lunaria annua) 
Lumen Print - Positive and Negative
Agfa Multicontrast Premium Paper (expired March 2006), 20 minute exposure