If a solid precipitate forms, then a few more drops of nitric acid should be added, and if the liquid does not clear it up it is albumin.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
From the kidneys, on the other hand, are thrown out the waste products resulting from the destruction of the foods and tissues containing nitrogen-of, for instance, albumin, fibrin, gluten, casein, gelatin, woody tissue, etc.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
If albumin is ever produced by synthesis in the laboratory it will probably be dead albumin.
"The Mechanism of Life"
Stéphane Leduc