Almost every bookmark ever made was designed to be free. It came tucked into a purchase, printed by a shop, handed out at a fair. It was never meant to outlast the book it marked, and most of them don't.
A fine art bookmark starts from the opposite idea: that the smallest object in a reader's hands is still worth making properly.
Cotton paper, not card
An ordinary bookmark is printed on coated card or pulp paper. Both are made from wood, both are chemically unstable, and both yellow and crack within a few decades. A cotton paper bookmark behaves differently. Cotton fibres are long and stable, and the paper made from them resists light, humidity and the acids that destroy pulp paper from the inside.
The weight is the first thing you notice. At five hundred grams per square metre, it sits in the hand more like a thin tile than a slip of card.
A museum-grade print, not a photocopy
The image is not run off at a print shop. It is a fine art print, made with pigment inks rated for over a hundred years of light-fastness, on Hahnemühle Photo Rag, the same paper specified by museums for their limited editions. The blacks are deep and the tones continuous. Held to the light, it reads as a photograph, not a reproduction of one.
Numbered, one of one hundred
Each photograph exists as one hundred bookmarks, and no more. On the back of each, in the corner, the number is written by hand: one of one hundred, two of one hundred. When the hundred are gone, that photograph is closed.
It is a small thing, but it changes what the object is. It stops being stock and becomes one of a fixed number. In the plainest sense, it is collectible.
Why a bookmark like this costs more
A bookmark from a shop costs a euro or two, and is worth roughly that. A fine art bookmark costs more because almost none of it is automated: the cotton paper, the pigment printing, the cutting, the numbering, the acid-free sleeve, each done by hand in the studio. What you are paying for is an object built to still be in a book in fifty years, looking exactly as it does today.
That is the whole idea. A bookmark you would not lose, in paper you would not throw away, made to last as long as the books it lives in.