Cartridge status indicator

A fire suppression system comprising:

• a cylinder for holding a fire suppression agent, the cylinder comprising a valve for controlling the release of the fire suppression agent;
• and
• a cartridge operatively connected to the valve, the cartridge comprising:
• a body for holding a pressurized gas, the body comprising a breakable seal for releasing the pressurized gas when broken;
• and
• a status indicator connected to a surface of the body, the status indicator comprising a first state and a second state, wherein the status indicator undergoes a change from the first state to the second state when exposed to a change in a physical parameter of the surface of the body, the change in the physical parameter indicating a change in a pressure of the pressurized gas as a result of the pressurized gas in the cartridge being discharged wherein the change in a physical parameter of the body comprises an increase in relative humidity beyond a threshold relative humidity value, the change from the first state to the second state by the status indicator defined by at least a portion of dissolvable crystal dissolving and changing to a color.