Retail store services, and on-line retail stores services featuring standards and certified reference materials, namely, certified samples of chemical solids, liquids, and gasses in the nature of reagents for non-medical use, reagents for chemical analysis, reagent chemical mixtures of known composition for chemical analysis, rare earth metals, synthetic and natural oxides in the form of powders, liquids, pastes and granules, used for calibrating analytical equipment, and for use in laborator...