Traditional Culture Encyclopedia - Photography major - What should I do if spray head turns blue?

What should I do if spray head turns blue?

1, according to the nozzle of the same size, buy a new nozzle to replace the original blue nozzle.

2. The blue color of the fire sprinkler indicates that the sprinkler is corroded, so it should be removed, and the sprinkler should be polished and painted to prevent the sprinkler from corrosion.