OK - here's what I think I've figured out. Noodler's black and luxury blue are the only two of the Noodlers inks (either their label or Swisher) that are tested not only to be waterproof but also resistant to alcohol, bleach, and other chemicals. In other words, the most durable of their line. Everything else that is labelled waterproof is not tested to the same level.
So then there are the "waterproof" or "eternal" inks (which I'm taking to mean the same thing - but I could be wrong) are tested against water but no other chemicals. So I think I've got the Noodler's "eternal" inks are sold via pendemonium including legal lapis which is exclusive to pendemonium, the Noodler's waterproof inks are sold through their vendor network including swisher. Swisher also has the Swisher line made by Noodlers but which do not include any waterproof inks. Swisher also has the Swishmix inks which apparently seem to be waterproof on some level but these are the most confusing as they aren't the "contract" ink Swisher used to sell - are they waterproof to the same level as the "eternal" and other "waterproof" inks?
Sheesh. This is far too confusing. Here's my dilemma. I really need some sort of "eternal" ink for check writing etc... Since I currently have no black ink that would make a good choice but I just don't use black that often in my daily use - I mostly use blues, greens and burgundy, but it is the most waterproof. the luxury blue seems appealing but the cost/small quantity for a frequent use ink doesn't seem like the best deal. Legal lapis is an OK color but I admit I'm not knocked out by the somewhat faded appearance (I like florida blue, american blue, midnight blues as a point of reference). If I'm going to pay a premium for the waterproof charachteristics I'd like it to be a color I really like.
Any suggestions or help sorting all this out would be most appreciated!