Collections kept in damp places or in a moist climate are very liable to
mold, and under such conditions it is difficult to avoid this evil.
Carbolic acid is recommended, but Mr. Ashmead, who has kept a large
collection in the moist climate of Florida, has found the use of
naphthaline much more satisfactory. Mr. Herbert H. Smith who has had
more extensive experience in the tropics prefers the carbolic acid.
Moldy specimens may be cleansed by washing with carbolic acid applied
with a fine camel's hair brush.