Taylor DPD Reagent #3 Dropper Bottle, 3/4 oz | R-0003-A-24

All reagents have a shelf life, whether they are liquids, powders, crystals, tablets, or test-strip pads. If kept dry, powders and crystals are very stable; acids are also long lived. Date of manufacture is not the controlling factor when it comes to shelf lifestorage conditions are more important.