Proper bottled fountain pen ink, 30 ml a bottle, in colours worth writing a letter to use: deep Bordeaux, warm Brown, forest Green, Hot Pink, Orange, Red, Turquoise, Violet, and the two everyday anchors, Black and Blue.

A bottle refills a converter or a dip pen dozens of times over, which is the whole point: it costs less than a pack of cartridges and it lets you write in a colour nobody else in the room is using. Pair it with a journal from the shelf above and the ordinary to-do list turns into something you look forward to. Pick your colour above — we restock these by the shade, not the set.