Look after your Ferro Rod

It's one of your most important bushcraft items, but do you know how easily they degrade in water or if kept in a damp environment?

just seven days in a damp environment produced a ferro rod like this

that's a serious amount of corrosion

however, luckily, if you catch it in time the corrosion tends to be not as bad as it looks and can be scraped off and the rod used as normal, but I wouldn't like to find it after a month of neglect.