The albumen paper that we sell at Bostick and Sullivan is egg white gelatin machine coated on rag art paper. We do them in large rolls and it stinks to high-heaven. That being said, you apply some silver nitrate, expose, tone or whatever you would like. They turn out great. Here's an example of one donated to the photo-review auction a few years ago. If memory serves me right, it's toned in gold.

Albumen.jpg