Science, Tech, Math › Science Chemical Storage Color Codes (NFPA 704) J. T. Baker Storage Code Colors Share Flipboard Email Print These are examples of NFPA 704 warning signs. Nuno Nogueira Science Chemistry Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Anne Marie Helmenstine, Ph.D. Facebook Twitter Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. Learn about our Editorial Process Updated on January 26, 2019 This is a table of chemical storage code colors, as devised by J. T. Baker. These are the standard color codes in the chemical industry. Except for the stripe code, chemicals assigned a color code generally may be stored safely with other chemicals with the same code. However, there are many exceptions, so it is important to be familiar with the safety requirements for every chemical in your inventory. J. T. Baker Chemical Storage Color Code Table Color Storage Notes White Corrosive. May be harmful to eyes, mucous membranes and skin. Store separate from combustible and flammable chemicals. Yellow Reactive/Oxidizer. May react violently with water, air or other chemicals. Store separate from combustible and flammable reagents. Red Flammable. Store separately only with other flammable chemicals. Blue Toxic. Chemical is hazardous to health if ingested, inhaled or absorbed through the skin. Store separately in a secure area. Green Reagent presents no more than a moderate hazard in any category. General chemical storage. Gray Used by Fisher instead of green. Reagent presents no more than a moderate hazard in any category. General chemical storage. Orange Obsolete color code, replaced by green. Reagent presents no more than a moderate hazard in any category. General chemical storage. Stripes Incompatible with other reagents of the same color code. Store separately. Numeric Classification System In addition to the color codes, a number may be given to indicate the level of hazard for flammability, health, reactivity, and special hazards. The scale runs from 0 (no hazard) to 4 (severe hazard). Special White Codes The white area may contain symbols to indicate special hazards: OX - This indicates an oxidizer that allows chemical to burn in the absence of air. SA - This indicates a simply asphyxiant gas. The code is limited to nitrogen, xenon, helium, argon, neon, and krypton. W with Two Horizontal Bars Through It - This indicates a substance that reacts with water in a dangerous or unpredictable manner. Examples of chemicals that carry this warning include sulfuric acid, cesium metal, and sodium metal. Featured Video Cite this Article Format mla apa chicago Your Citation Helmenstine, Anne Marie, Ph.D. "Chemical Storage Color Codes (NFPA 704)." ThoughtCo, Sep. 7, 2021, thoughtco.com/chemical-storage-color-codes-606034. Helmenstine, Anne Marie, Ph.D. (2021, September 7). Chemical Storage Color Codes (NFPA 704). Retrieved from https://www.thoughtco.com/chemical-storage-color-codes-606034 Helmenstine, Anne Marie, Ph.D. "Chemical Storage Color Codes (NFPA 704)." ThoughtCo. https://www.thoughtco.com/chemical-storage-color-codes-606034 (accessed December 7, 2021). copy citation MSDS or SDS Definition: What Is a Safety Data Sheet? UN ID Number Definition for Chemicals Understanding Weather Warning Flags Using Material Safety Data Sheets What Is NFPA 704 or the Fire Diamond? Setting Up a Home Chemistry Lab Examples of Physical Changes and Chemical Changes Learn the pH of Common Chemicals Ammonium Nitrate Facts and Uses The Most Common Injuries in a Chemistry Lab Zirconium Facts (Atomic Number 40 or Zr) Study Habits That Can Improve Grades and Performance How to Make Chemical Piranha Solution Printable Lab Safety Sign Quiz Chemicals You Should Never Mix What Is Smog?