DragonessLife's works have a lot of anthro-type dragons and such, and while the purple eyes go with the lips and nails, they aren't a normal eye color. So I was working under the assumption that either: A.) That's not human saliva, and is acidic or whatever green indicates these days, or B.) It's a stylistic choice to pop the color. Translucent white-ish would not show up as dramatically in these tones.
Of course, do realizing that that's just my take on it. I have no source to check right off.
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