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developer

7 7.0

A chemical solution that makes a picture appear on film or paper

noun
/dɪˈvɛləpər/

Specialized

: revelador

So I've put the, I've put the exposed the exposed paper into the developer and hopefully we'll see an image appearing.
aqueous developer
D-76 developer

These receipts often contain BPA, which is used as a color developer in the thermal printing process.

Examples

Filtration of all the chemicals, i.e., developer, stop bath, fixer, and even wash water, is essential.

Academic text (1995)
I remove the print from the developer and put it into the tray of water for a few seconds.

Academic text (2003)
I got that carton of developer you asked for.

Nadine (1987)
I feel that the consistency of the special developer adds to the consistency of the process.

Academic text (2003)
If a digital camera is not available, many photo developers can develop regular film onto a floppy or compact disc.

Academic text (2001)
To develop the photos, she carefully mixed the developer with water before using it.
He poured the developer into the tray, ready to reveal the images on the photo paper.
After the film was exposed, it needed to stay in the developer for the recommended time to ensure proper development.

Surface Forms

developer singular

developers plural

Morphology

developer = develop (opaque) = develop + er

While 'developer' is formed from 'develop', the specific meaning related to photography is specialized and not directly inferable from the base word.

Etymology

Developer comes from the parts de- ('off') and velop ('wrap'), so it originally meant to 'un-wrap' or 'bring out'. A photographic developer is the chemical that 'brings out' the hidden picture on film, like opening an envelope.