I believe that you'll find that the term "pigments" may refer to colors that can become a solid within a loop. Also, many pump manufacturers may tell you the same information, but only if you ask them.
Also, some pumps are different, even within the same manufacturer. With my LGPC 2-MDQ-SC, which is a true mag drive, the issue may not be as important, but with my Johnson CO30P5-1, which is a direct drive, the pigment solids may very well get lodged within the bearing (if it's indeed a bearing!).
To my knowledge, all highlighters contain pigments (hence why you can see it!). The UV feature, if present, would be an add-on.
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