Graphology - the study of handwritings; autograph - written with one's own hand; seismograph - a machine noting strength and duration of earthquakes. marina - a harbor for pleasure boats; maritime - relating to the sea; submarine - an undersea boat; aquamarine - color of sea water.
Chemicals are classified into various hazard classifications in accordance with their physiochemical properties and health hazards. Each class of chemical has a pictorial symbol called a danger symbol.
Grades of Chemicals General ï· Reagent A.C.S. - This designates a high quality chemical for laboratory use. The abbreviation A.C.S., means the chemical meets the specifications of the American Chemical Society. A Certificate of Analysis is available upon request. ï· Guaranteed Reagent (GR) - Suitable for use in analytical chemistry, products meet or exceed American Chemical Society (ACS) requirements where applicable.