The very early development and extraction of Penicillin was a very small, impure and very low-active yield
after all these efforts of purification and extraction, but it was nonetheless the start of a new era in medicine with a massive influence on the human standard of living. Tiny amounts of orange and yellow Penicillin Sodium Salt were collected into small bottles. In the first place the Penicillin was tested on mice both because their body is 2000-3000 times smaller than a human body and they don't need that much Penicillin to heal a life-threatening infection wound, and, more especially, to see if the extracted Penicillin salt was strong enough to act like the drug which was expected from the scientists.
The support of a commercial company was immediately needed to produce enough material in large-scale industrial production. That was finally found in July in 1941 in the Northern Regional Research Laboratory of the Department of Agriculture in Peoria, Illinois, U.S.A. and just a few months later the production of millions of mega-units of pure and white Penicillin Sodium Salt was possible especially for the purpose of war surgery.
One of the usual arguments between Ernst Chain and Norman Heatley:
"Heatley, I'm telling you Penicillin is ...
(Ernst B. Chain)
. . .
"Chain ..., your Penicillin is White."
(Norman G. Heatley)