Figure 1.
Appearance of white hydrogel (left) and hydrogel containing calendula extract (10%) after the free radical polymerization reaction (right).
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.