Fountain Pens
Traditional iron gall inks intended for dip pens are not suitable for fountain pens as they will corrode the pen (a phenomenon known as flash corrosion) and destroy the functionality of the fountain pen.
Instead, modern surrogate iron gall formulas such as blue-black bottled inks by Lamy, Montblanc, Chesterfield's Archival Vaultor, Diamine Registrar's Ink, Ecclesiastical Stationery Supplies Registrars Ink, Gutenberg Urkundentinte G10 Schwarz (certificate ink G10 black) or Rohrer & Klingner "Salix" and "Scabiosa" inks are offered for fountain pens. These modern iron gall inks contain a small amount of ferro gallic compounds, but are gentler for the inside of a fountain pen, but can still be corrosive if left in the pen for a long period. To avoid corrosion on delicate metal parts and ink clogging a more thorough than usual cleaning regime - which requires the ink to be flushed out regularly with water - is sometimes advised by manufacturers or resellers. The color dye in these modern formulas functions as a temporary colorant to make these inks clearly visible whilst writing. The ferro gallic compounds through a gradual oxidation process causes an observable gradual color change to gray/black whilst these inks completely dry and makes the writing waterproof.
In the United Kingdom the use of special blue-black archival quality Registrars' Ink containing ferro gallic compounds is required in register offices for official documents such as birth certificates, marriage certificates, death certificates and on clergy rolls.
In Germany the use of special blue or black urkunden- oder documentenechte Tinte or documentary use permanent inks is required in notariellen Urkunden (Civil law notary legal instruments).
Read more about this topic: Iron Gall Ink
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