Working for a state occupational safety and health program and as a safety and health consultant for over 40 years, I have learned the value of understanding the peculiarities of any chemical being used on the job site. My natural “science bent” made learning about chemistry from a practical standpoint not only interesting, but kind of fun. Nevertheless, I know that for many people even mentioning the word “chemistry” is the farthest thing from enjoyable. Despite some having a natural aversion to the subject, it is imperative that professionals in the restoration industry have a solid knowledge of the types of chemicals they use on a regular basis. To that end, this article continues a series of information presented in terms appropriate for you, the contractor, to help explain different types of restoration chemicals and the proper procedures for using them to keep workers and occupants safe.