Aviation Colour Codes recommended by the International Civil Aviation Organization (ICAO)
GREEN	Volcano is in normal, non-eruptive state.    or, after a change from a higher level:  Volcanic activity considered to have ceased, and volcano reverted to its normal, non-eruptive state.
YELLOW	Volcano is experiencing signs of elevated unrest above known background levels.     or, after a change from higher level:  Volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
ORANGE	Volcano is exhibiting heightened unrest with increased likelihood of eruption.    or, Volcanic eruption is underway with no or minor ash emission. [specify ash-plume height if possible]
RED	Eruption is forecast to be imminent with significant emission of ash into the atmosphere likely.   or, Eruption is underway with significant emission of ash into the atmosphere. [specify ash-plume height if possible]