Shading, sheen and shimmer explained
Three words you will see all over our ink library, and what they actually look like on paper.

Shading is the variation in colour inside a single stroke. Ink pools at the end of a line and dries darker, so one letter can hold two or three tones. Wetter nibs and smoother paper make it stronger.
Sheen
Sheen is a second colour that appears where very saturated ink dries on top of coated paper. Bosphorus Teal flashes red, Lapis Ledger flashes gold. You need a wet nib and paper that keeps the ink on its surface.
Shimmer
Shimmer inks carry fine mica particles. They are beautiful and need care: use a broad, wet nib, rock the bottle before filling and flush the pen every week.