There were no iridescent rings on glassy papers or chemical attack on book covers. Odor level was minimal. Odors and chemical attack on some book covers are caused by higher temperatures. Iridescent rings on coated papers and covers are eliminated by maintaining a high enough DEZ flow rate. Near-perfect treatment is achievable.
Problems are resolvable with minor engineering changes.
All types of papers, including coated and dense, supercalendered papers, are thoroughly treated. Pyrophoric nature of DEZ needs good engineering, good safety practice and constant maintenance. A complex technology, for which engineers and other technical staff are needed 24 hours a day. Plant must be situated away from the library. Therefore, books need to be transported to and from the plant.