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Mixed some inks for the first time
A fellow Jacques Herbin aficionado?
Now before I forget, for the future, I would recommend investigating test tubes: you can plug them to keep the ink from spilling or evaporating, shake them to mix, and use them to fill up your pens, keep them upright. They have two major drawbacks though: still can't finish ink from them, and they don't protect from light. Also, for this kind of fill, I find it easier to pull the feed out and fill from the section than mess with the piston.
Now, when you want to mix inks, you need to remember one important aspect of the human eye: it is twice as sensitive to green as it is to blue (give or take), and when you think about that, you can understand how blue our planet truly is, or how grey plants might actually be.
Also, mixing inks should be fine if you use inks from a same brand, because that's basically what inks are: a mix. But it's a good idea (so one I disregard of course) to not mix dye based with pigment based, because that's when things go a little unstable, separate, or have odd reactions. Don't get me wrong, you can get shifting hue from mixing two dye based inks from a single brand, but it's nothing a good shake can't fix, usually.
If you really want to start mixing inks, you should check out magnetic stirrers. And no, I'm genuinely not trying to be an enabler.
I don't find your green and blue result to be that surprising: you mixed a green that's pretty yellow, with a very dark blue that sheens red, so when you think about it, it sort of checks out.
What I find, maybe not funny per se, but intersting, is that I'm fairly confident we could find the resulting mixes in Herbin's lineup. It's hard to say for sure, but I think your purple might be their Poussière de lune, your orange could match their Rouille d'encre, your resulting light black seems close to their Gris galet, although your green... Lierre sauvage maybe?
Also, you don't have to fill up your pen, you can also use it as a dip pen (provided it's empty and clean).
And I'm with you on the distinctions: I have a bunch of black inks, but some of them are black, and some of them are... slightly darker black.
Edit: typo