Yesterday I had a science class where we were testing the acidity and alkalinity of different liquids. I saw that as the perfect opportunity to put the permanency of some "permanent" inks to the test as there were a few chemicals on hand. I had three inks on hand: Noodler's Bulletproof black, Rohrer und Klingner Salix and Parker Quinkflow ballpoint ink.
The Noodler's didn't budge, while the iron-gall was obliterated by the bleach, and changed colour for the ammonia and hydrochloric acid, and the Parker ballpoint turned red with bleach and then faded some more, and hydrochloric acid life a blue dye component.
Just a little something to fuel one's curiosity
Edited by Lunoxmos, 31 August 2019 - 01:31.