Anyhow, UV light didn’t effect it at all, and because we didn’t want to ruin our pH tester, we didn’t check its pH level, either. We DO NOT recommend it for fountain pens. This is a goupy, heavily sedimented ink filled with gold-glitter. The only color not yet mentioned is the Francesco Rubinato Oro (gold). Was that because it was already discolored and UV exposed or was Rotring red really like that? Either way, UV didn’t effect the dry ink on the page. It was more of a brick red with a hint of orange. We had never previously heard of Francesco Rubinato inks before, but we loved the “Verde” green ink that was somewhere between “Shamrock Shake” and “Kelly Green.” Unfortunately, it turns into a bile-like yellow green with UV exposure.Īn OLD bottle of Rotring Red was a very curious color. If it is pH neutral, I wonder what chemical reactions happen when it is inside a pen. We are often warned red can be the most dangerous color to put in a fountain pen. Also interesting was that Omas’ ink was also almost pH neutral at 7.2. Waterman’s Red and Omas’ Red/Burgundy held up best. Pelikan Violet held on kinda, turning a deep reddish pink. Vintage 1960s’ Waterman’s Violet almost completely disappeared. Visconti’s black turned a dark brown in the sunlight. There were subtle changes in some of the inks. Omas was the most acidic blue at 2.3, and Colorverse was the most neutral at 7.9. Acidity didn’t seem to effect which brands faded and didn’t. Omas blue did what most blues do and faded heavily. Colorverse Quasar turned from a rich blue to a light red-purple. Instead of fading out like most blues, it turned purple! Visconti blue fades out when thinly applied, but the thicker lines create a majestic blue-black that is even prettier than the original blue. One of my all-time favorite blues is Parker Penman Sapphire. Surprises are the most enjoyable parts of these tests. The closer you get to 14, the more alkali/base the ink is. The closer you get to 0, the more acidic the ink is. As a quick chemistry refresher, a pH of 7 is neutral like distilled water. We have a professional pH tester, which we calibrated just before testing these inks. As we do not know the chemical composition of each ink or ink sac/converter it might go into, a pH neutral ink does not guarantee it won’t have a bad chemical reaction inside your pen. The following is all raw data that we thought you might find interesting. We also tested the pH levels of the inks to see just how neutral they are. This batch of inks was given a UV light fast test in our sunniest window from March 7, 2021, to June 7, 2021. Click the image above to get a better look at the ink tests. The ink proof sheet is on the left and the UV tested inks are on the right.
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