Retracing the Chemistry of the First Photograph

StarEmperor writes: "CNN has this article about experts trying to determine how the world's oldest known photograph (1826!) was produced." Even though the basic process is known, the details of how it was produced are lost.

Comments

Bigger Version of the Picture

[AKA da JET]

I found a larger version of the picture here. I still don't see the tree. :-/