Here’s another entry in the Diamine “Forever” series of water-resistant pigment inks: Butterscotch
It’s mostly a light brown with some darker brown shading. It doesn’t really have sheen in the traditional sense, but it is somewhat shiny.
The Diamine Forever line of inks are water-resistant pigment inks. Take care when using pigment inks! Use a pen that seals very well or write the pen empty in a short amount of time and clean the pen out promptly, otherwise the pigment particles may cause a clog.
Scans
The scans lack the sheen, as usual, but they make it easier to see shading in some of the lettering.
Photos
While there isn’t any traditional sheen, the areas with more ink are a bit shinier than usual. They almost look sticky, but they aren’t.
Microscope
It looks even stickier under magnification!
Chromatography

The chromatography is pretty much all brown and tan and mostly near the start.

Nothing too noteworthy under UV light, but there is a slight blue halo past the leading edge.
Verdict
I need to use it more before forming a full opinion, but I like the color so far.
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