fix·a·tive 
(fĭksə-tĭv)
(fĭksə-tĭv)n.
Something that fixes, protects, or preserves, especially:
a. A liquid preservative applied to artwork, such as watercolor paintings or charcoal drawings.
b. A solution used to preserve and harden fresh tissue for microscopic examination.
c. A liquid mixed with perfume to prevent rapid evaporation.
fixa·tive adj.