Hello, As a microbiologist and a life-long user of fountain pens, the problem of contaminated or "infected" bottles of fountain pen inks has long been a place where my interest have intersected. I have never experienced this problem (lucky me!), so I am forced to look for reports from other users. I do, however, understand the angst that accompanies the loss of a bottle of well-loved, and expensive ink for any reason. Ouch! A question occured to me the other day: has anyone had a contamination problem with a bottle of iron gall ink? I cannot recall seeing any reports of a bottle of iron gall ink contamination. If so, please give as many details as possible. If not, and you are a ling-time user of iron gall inks, let us know that, too. In this instance, negative and positive results are both important. I welcome any and all comments and observations as well. Thanks! Brian