KWZ Iron Gall ink 60 ml.

KWZ - Iron Gall ink

Although should be noted that in case of leaving Iron Gall ink in unused pen for a very long period of time, and depending on its drying out on many factors, it is possible occurrence of corrosion in the case of pens with nibs made of stainless steel.
Nibs made of for example gold, titanium, palladium, platinum, silver, etc. are generally resistant to corrosion and it is not possible under any circumstances to have corroded by the Iron Gall inks or any other known to me type of ink.