As a graphic artist I have often resorted to colored felt pens for sketching and rendering. But the selection of colors offered by present commercial sources are extremely limited. And frequently they are far too intense and not attractive. It would be simple enough to offer a kit of basic concentrated dye colors that can be combined drop by drop with an eyedropper type cap into an insertion container to provide almost any color desired in any intensity. A dozen or so unfilled pens using transparent tubes could be supplied with the kit. When the container using hypodermic techniques squirts the formulated color into the unfilled tube, the color of the felt reservoir in the pen would become obvious through the transparent wall of the tube. Supplies of dyes and unfilled pens should be available separately so the artist could build up a library of personal colors to make distinctive graphics.
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Hi! Have you found any comercially available unfilled felt pens meanwhile? Thanks, Nuno
This probably wouldn't be quite as mainstream, but it seems like it would be a great thing for art supply stores that would already sell things like calligraphy inks and pens; it's a similar enough concept that it shouldn't be hard to do.