For what two important reasons should you always carefully read and double check the labels on reagent containers before using reagents? when reagent bottles (bottles with chemicals in them) are taken from the shelf or front counter, they should be returned immediately to their original place after use. read labels on reagent bottles carefully before using the reagent, in order to be sure you have the correct chemical and to become aware of any safety hazards. do not use more or less of a reagent necessary for any given experiment. do not return unused reagents to the reagent bottle. true false