http://www.aviationfuelling.co.uk/decals.htm
Grade and Warning Decals
http://www.farmington.nm.us/depts/comdev/airport/fuelingStan...
A4. Shall be identified by grade labels and color coding in accordance with the American Petroleum Institute Standard 1542, “Airport Equipment Marking for Fuel Identification”, as well as, any aboveground storage tank over 100 gallons (water capacity) permanently installed, mounted, or affixed and used for storage of Class I, II, or III-A liquids shall bear the label or placard in accordance with Uniform Fire Code Standard No. 79-3, identifying the material therein.