A "black" permanent marker can make for some very interesting results on some materials
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@hazelnot I don't think the pigment in the marker ink is all that black, really, it just looks that way on white paper due to the contrast; so if you use it on a reflective surface like this, it has a very interesting color sheen... I've observed similar things happen with different kinds of markers on different colors of paper and other materials
@hazelnot Still want to try what happens with a translucent 3D print at some point