Some of the inks are faux Iron Gall inks. Faux Iron Gall inks contain certain herbs which give it color changing properties but are maintenance free. Refer individual ink properties for more information.
This contains iron gall. Refer pen manufacturers recommendations before use especially in expensive pens.
If the pen is not going to be used for longer duration then it is better to transfer unused ink into bottle, wash & dry the pen for storage.