The ink is a bit more viscous than most others, but flows very well and have some lubricity. I´m not sure how much pH neutral it is, but will update if I get the info. The latter is a British norm for permanent record inks, and as the Brits are quite hardcore (another word would fit here better.) about what to consider "permanent record", it means quite a lot. It darkens over period of several minutes to several months into flat black with greenish hue.The more it darkens, the more it is resistant to any kind of wash-out. The colour is dark grey-black or black-grey with distinctive greenish hue, depending on paper and pen combo. Probably it is one of the few formulas which work with chemical interaction with celulose in the paper. It is not an iron-gal ink, it is not a graphite ink, no way it is a more stable breed of "coloured writing lotion". I can´t say what is it based, as this is kept secret as far as I know. They have a basic, but usefull range of comon grade writing and india inks in several colours, but kind of "just by the way", they have in portfolio ![]() This company is the original, first succesfull creator of todays most simple and notorious writing instrument-a graphite pencil in a wooden stick.įrom the brief above is quite clear, that Koh-I-Noor is realy not specialized in inks. Their sortiment is broad enoght to cover whole range from hardcore development engineers through different artists by trade to hobby pencil cartoonists. ![]() Koh-I-Noor Hardtmuth is a famous manufacturer of (not only) writing, scribing and painting "tools" and accountrements of all kinds, with over 200 years of continuous history from former Austro-Hungarian Monarchy to current Czech Republic.
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