KWZ Mandarin is a handmade Iron Gall ink from Poland.
Iron Gall inks were used in medieval times for writing manuscripts and are gaining popularity again as they are extremely long lasting on paper. The colour darkens over time unlike standard inks which tend to fade over the years. You will notice with Iron Gall inks that the colour changes immediately in front of your eyes, for example pink becomes violet or orange becomes brown. KWZ Iron Gall is also water resistant to some extent. The dyes can be washed away, but the iron gall component is permanently bonded with the paper, so the text is still easy to read even after soaking.
Iron Gall Mandarin Ink is Light Iron Gall which means that the iron gall concentration is very low and pen maintenance doesn't differ from using standard ink.
Please see Use and Care for notes about cleaning a pen using Iron Gall Ink.
The pen filled with Iron Gall ink does need some special care, similar to when any permanent ink is used. It is recommended not to leave it unused for a long time as the ink may dry out and be difficult to clean out of the pen. However, if Iron Gall inks are used on a daily basis, there are no special requirements.
||Bottled fountain pen ink