Frequently the lepidopterist is faced with the problem of mounting an inordinately larze number of specimens taken on a field trip. Most butterflies and larger moths may of course be pinned or papered and relaxed at leisure for mounting, but this method does not work well with smaller moths, which even if pinned immediately should be mounted quickly before drying occurs. Even a specimen as large as an average-sized Noctuid is not really a satisfactory subject for spreading after drying and relaxing. The recent republication of Tindale's 1962 observations on the ability of chlorocresoI to retard drying (Tindalc, 1973) has again called attention to this very useful method, but all investigators do not have ready access to chlorocresol. Another method of retarding the drying of specimens during storage is that of freezing.
Wilkinson, Ronald S.
"Freezing Lepidoptera for Temporary Storage,"
The Great Lakes Entomologist, vol 7
Available at: https://scholar.valpo.edu/tgle/vol7/iss1/2