In 1856, if you wanted to take a photograph, you didn't buy a camera — you became a chemist. Charles A. Long's modest shilling pamphlet, sold at Bland & Long's optician shop on Fleet Street "by appointment to the Queen," promised to teach any enthusiast to capture light on glass and paper through no fewer than five distinct chemical processes: collodion, albumen, calotype, waxed paper, and positive paper.

Long opens with a striking admission about the state of the art:

"In the following pages I purpose to confine myself to a description of the Photographic processes on Paper and Glass, as being the two modes of fixing the luminous image that present the most difficulties to the beginner, and, moreover, are those which at the present time are occupying to the greatest extent the attention of the Photographic world."

What strikes the modern reader is the phrase "fixing the luminous image" — a beautifully precise description of what a camera actually does, before "taking a picture" became a thoughtless act performed by glass slabs in our pockets. In 1856, every photograph required handling silver nitrate, ether, collodion (gun-cotton dissolved in solvents — literally an explosive), and albumen (egg whites, painstakingly beaten and aged). The "waxed paper process" Long mentions involved literally ironing wax into paper to make it translucent enough to serve as a negative.

What was lost? The waxed paper process, developed by Gustave Le Gray in 1851, allowed photographers to prepare paper negatives days or even weeks in advance of exposure — a kind of slow-photography that doesn't exist today. A traveler could prepare a stack of sensitive sheets at home, carry them across Europe, expose them at leisure, and develop them upon returning. The wet collodion process Long champions had to be coated, exposed, and developed within about fifteen minutes, before the plate dried.

Modern photographers rediscovering "alternative process" photography — cyanotypes, salt prints, wet plate collodion — find that Long's 170-year-old instructions still produce images of haunting tonal richness that digital sensors cannot replicate. The albumen print, made with egg whites and silver, yields a warm chocolate-and-cream image with a glossy sheen no inkjet has matched.

Long's pamphlet also reveals a forgotten cultural fact: photography was a hobbyist's pursuit requiring laboratory skill. There was no separation between "photographer" and "chemist." The same Fleet Street shop sold you the lens, the chemicals, the recipe book, and the queen's endorsement — a one-stop entry into what was understood as a branch of applied science.

The next time your phone autocorrects a sunset's white balance, consider that someone once boiled their own egg whites to make the same picture last a century.