Case file

The Great Oxidation Event (c. 2.4 Billion BCE)

The Cyanotype

The sources document the surrounding history; they do not establish Akina’s presence or influence. This recurring cat and the case theory are fictional. The visual is an AI-generated reconstruction, not a historical artifact.

Historical context

Between roughly 2.4 and 2.0 billion years ago, cyanobacteria in the shallow oceans began producing oxygen as a waste product of photosynthesis, and the gas accumulated in the atmosphere for the first time. To the anaerobic organisms that dominated the planet it was a poison: free oxygen destroyed them, and the event is associated with one of the largest extinction episodes in Earth's history, as well as with the deposition of banded iron formations, marine iron that oxidised and sank out of the water. The sky it produced is the first sky with a colour. Separately, the cyanotype was invented by Sir John Herschel in 1842: paper sensitised with ferric ammonium citrate and potassium ferricyanide, exposed to light, and developed in water. The image is not silver at all but Prussian blue — a ferric ferrocyanide — and it bleaches with age, the blues lifting unevenly towards white while the exposed shadows retain them.

The sighting — unverified

Unverified lead: A cyanotype on laid paper, unprovenanced and uncatalogued beyond the pencilled note 'sea, no date'. The blue is uneven and has faded heavily towards the edges, leaving a pale irregular rectangle where the sheet was once masked or framed. In the centre, the cat appears in reverse: not blue but bleached out of it, an unpigmented white silhouette with its edges dissolving into the blue, as though the sheet had been protected where she sits and printed everywhere else. Her eyes are the only dark thing in her — two small Prussian blue points. No collection, dealer or photographer's estate records this print.

Evidence — interpretation

The paper is a genuinely hand-coated cyanotype: brush marks and a slightly uneven blue density show where the sensitiser was floated on, and the negative blue at the border is the pale edge left uncovered. The bleaching is not painted but genuinely faded — Prussian blue reduces to a paler, greyer blue under light, and the pattern of loss here follows the shape of an old mount, not a design. The white silhouette is not masked paper; the fibre texture continues through it, and the fine craquelure of a dried and cockled sheet crosses the white and the blue equally. The two dark points of the eyes are the print's only retention of full density, which is what happens when a denser object was laid directly on the coated sheet: a photogram, not a negative print.

Competing reading

A photograph from the 1840s cannot record a biological crisis two billion years in its own past, and Herschel's process was invented to copy drawings and botanical specimens, not to make cosmological claims. The 'cat' is more simply the shadow of something laid on the paper during exposure, or a masked area the size of a hand. Nothing establishes who made this or why the sheet was never mounted. The reading that binds a faded blue print to the sky's first colour is elegant, which is exactly the reason to distrust it: the case has chosen the interpretation that makes the damage meaningful.

Case theory — fictional interpretation

The first mass extinction on this planet was not caused by an asteroid or a volcano. It was caused by photosynthesis — by organisms that had no idea they were doing anything but eating light. They filled the sky with a gas that killed almost everything that could not tolerate it, and the proof is in the rock as bands of rusted iron that fell out of the sea. The cyanotype knows this in its own body: its blue is iron that has been oxidised and fixed, and its worst enemy is the light that made it. The print in the file is one long corrosion event, fading from the edges inward, and the only part that never faded is the two points of her eyes. She is not in the picture. She is the area that was covered while the world was exposed — which is the same trick the atmosphere pulled, and the same result: everything got paler except the thing watching.

Reconstructed voice — not a historical quotation

Reconstructed voice—not a verified quotation: “I did not poison anything. I only breathed out, and everything that was already there found it unbearable.”