Instant Film Accord

Instant film

An instant camera uses self-developing film to create a chemically developed print shortly after the picture is taken. In 1947 Edwin H. Land introduced the Polaroid-Land process.

In integral film, the layers that expose, develop and fix the photo are all built into a plastic envelope and frame. To develop the film, a pod holding a reagent is broken and its contents are spread within the film.

The reagent

In one type of integral film, the reagent held white pigment, opacifying dyes, potassium hydroxide and a thickener. The pigment was white titania in suspension. The reagent is highly alkaline, and when spread across the stack it dissolves and moves the chemicals in the stack, which starts the developing process.

Titanium dioxide, also known as titania, is an odorless white solid.

It is also an effective opacifier in powder form.

Colour layers

In subtractive colour instant film the negative has three emulsion layers sensitive to red, green and blue, each with a layer of developing dye of the complementary colour beneath it: cyan, magenta and yellow. A timing layer slows the reagent so that it does not activate the acid layer before the picture has developed.

The accord

In perfumery an accord is the equivalent of a chord in music: a blend of 2 or more smells that produces a third, new and distinctive smell. An accord may be a simple mixture or may consist of many materials.

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