I really need to do a catalog of my inks or something, because they are just a bunch of bottles in a cupboard. I have a vague idea of the ones I have, but since crossing the line of 40 bottles (which isn't that many, but I forget things easily), I am forgetting more and more. I use an ink rack full of tubes as my working stock, to prevent contamination or spillage of a full bottle. And in some cases, it's easier to work from a tube than the bottle - like with J. Herbin bottles - they are lovely, but they're also a pain.
But as I amassed more tubes in that rack, I had to lift each tube out to find the one I wanted and that would take awhile.
In swoops these tiny adorable little labels which I have now stuck on the tops of each tube to indicate what that tube is holding. Much better for picking through the entire rack now.