The excerpt itself is a graveyard of OCR — a scatter of dots and stray glyphs where the scanner failed to catch a heavily foxed page:

". . V , • •* * • • » • * • • > » t t • • • • * • • *£?'*"* * * w •> i ••■••• * * - • • ■•»•*•>••••«•«••••»»• . . . •• • - •••••••• •♦••••••••*.•»"

But what those dots guard is one of the most extraordinary lost techniques in the history of photography: the bromoil process. Emil Mayer — a Vienna lawyer, amateur photographer, and one of the great early street photographers of the Habsburg capital — wrote this 1923 manual to preserve a method that even then was already slipping away. (Mayer himself would later die by suicide in 1938 after the Anschluss.)

Bromoil is the forgotten claim that a photograph could be turned into an oil painting, chemically. The procedure:

• Make an ordinary silver-bromide gelatin print, deliberately overexposed and underdeveloped.
• Bleach it in a bath of potassium bichromate and copper sulfate. The silver image vanishes, but the gelatin now has an invisible relief: the shadows have hardened, the highlights have swollen with water.
• Soak the paper. The wet highlights repel greasy ink; the dry shadows accept it.
• Pick up lithographic ink on a stiff hog-hair brush ("hopping" the brush across the surface) and — over hours — hand-build the image, tone by tone, in any color you like.

The final print has no silver in it at all. It is, quite literally, an oil painting on gelatin, with the photograph's tonal map serving as an invisible template. And because the ink can be lifted and rolled onto damp paper under pressure, the same matrix yields bromoil transfers — permanent prints on watercolor paper indistinguishable from etchings.

What was lost when this technique died? A whole way of thinking about photography as a manual medium. Mayer's generation of pictorialists refused to accept that a photograph should look mechanical. Every bromoil is unique — no two brushings identical — and the photographer's hand is present in every square millimeter.

Is the claim still valid? Absolutely. A small revival community keeps it alive, and modern conservators confirm bromoils are among the most archivally stable photographic prints ever made: pigment ink on bare gelatin has no silver to tarnish, no dyes to fade. Some Mayer prints from the 1910s look untouched today, while their contemporary silver gelatin prints have yellowed badly.

The modern echo? Every time you drag a photograph into Photoshop and apply a "watercolor" or "oil paint" filter, you are reaching for what Mayer taught with brush and bichromate a century ago — only he did it, molecule by molecule, on paper that outlasts us.