Classification and storage of nitrates: While updating Safety Data Sheets (SDSs), I found some confusing changes in the listing of some nitrates.

Classification and storage of nitrates: While updating Safety Data Sheets (SDSs), I found some confusing changes in the listing of some nitrates.
Use of iron III nitrate and zinc nitrate: Is it still okay to use iron III nitrate and zinc nitrate, as they are not listed on the Recommended List of Chemicals for Schools.