What is collodion usp?

Collodion USP is a highly viscous solution made from nitrocellulose dissolved in a mixture of ether and alcohol. It is used in medicine as a topical dressing for wounds and as a protective coating due to its film-forming properties. In addition to its medical applications, collodion is also utilized in Photography and as a solvent in various chemical processes. The "USP" designation indicates that it meets the standards set by the United States Pharmacopeia for quality and purity.