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Noodler's amazes me. The color options, the shading, the water resistance (some-but-not-all inks). I have nothing but respect for Mr. Tardif. This thread is one of wonderment, amazement, and homage. One thing that irritates me, however, is that he does not offer a true bulletproof CYMK set (with the obvious exception of Black.) This means that the inks I want to make for myself won't be bulletproof. And bulletproofness is a sticking point for me, or at least water resistance. (I don't write anything worth forging anyway, so for the time being let's throw out bleach/acetone/ammonia/..... resistance.) So for the chemists in the room: how can one make a water-resistant, dye-based ink? The dye retailers I've called don't think it can be done. (They mostly retail to cloth dyers, so their lack of expertise in inks isn't surprising, but cellulose reactivity is cellulose reactivity; all cellulose-reactive dyes I've come across require activation with a base like soda ash or NaOH, and then are unstable in a bottle. ) The closest I've come to an explanation of Tardif's dyes on this forum is this: Unfortunately I saved the quote but not the link in my notes. I believe Chemyst stepped in and countered that yes, they are reactive dyes. We know that water resistant CYMK inks are possible, because De Atramantis makes them too. (Unfortunately they're very expensive here in the US.) So. Who wants to take a stab? What makes Bulletproof Black so bulletproof? How can one make a water resistant ink from a dye base? I'll offer some clues, or at least properties of Noodler's that I've noticed: --He offers (at least partially) water resistant blacks, and purples, and browns. (Though usually the water resistant component is black...) --He DOESN'T offer truly water resistant yellows or oranges. (Operation Overlord*) --He USED TO offer essentially CYMK inks from I think Swishers (Goldfinch for yellow, which he was "permanently sold out of" at one point, Hellbender Red, Brittania's Blue Waves -- see the Noodler's CYMK thread). He no longer does so. Is this lack of interest, or a change in availability, or....? --Noodler's likes to form bubbles in my bottles, indicating he uses A LOT of surfactant. This is also evidenced by the degree to which it nib creeps. So far I've: --Done patent searches related to inks (I still haven't found a single patent related to fountain pen inks; the ONE I was able to find seemed to talk about a "ball point fountain pen ink" which was odd.) There are lots of patents related to inkjets and ball points, but none specifically related to FPs. Most of the inkjet patents are pigment-related, but not all. --Done MSDS searches for major ink makers. I've learned some about what other stuff goes in ink, but the only actual dye I've found was a direct dye used in Pilot's rollerball inks. --Called Pro Chemical and Dye, DharmaTrading, and Keystone; the first 2 have no idea what I'm talking about (and think it's impossible); the last hasn't called me back yet. --Done general dye research, especially at . A list of threads worth reading if this topic encuriouses you too: Fabric Dye as a Basis for Ink: https://www.fountainpennetwork.com/forum/topic/269610-fabric-dye-as-a-basis-for-ink/ Make Your Own Ink https://www.fountainpennetwork.com/forum/topic/2183-make-your-own-ink/ The Open Source Ink Project: https://www.fountainpennetwork.com/forum/topic/227894-open-source-ink-project/ Physics Articles Related to FPs: https://www.fountainpennetwork.com/forum/topic/288121-fountain-pen-ink-behaviour-fountain-pen-physics-journal-articlesreferences/ Mixing Glycerine In Ink: https://www.fountainpennetwork.com/forum/topic/257406-mixing-glycerine-in-ink/ Surfactants in Ink for Improved Flow: https://www.fountainpennetwork.com/forum/topic/229403-surfactants-in-ink-for-improved-flow/ So.... thoughts?