Meanings of coat with gelatin in English

Don't talk about how nothing feels real, how everything is coated with gelatin and shining like oil in the sun.

After effecting the erasure the spot is often rubbed over with a powdered alum or gum sandarac, or coated with gelatin or size.

Wet plate photography was a tremendous palaver and photographers were just beginning to use plates coated with gelatin emulsions which remained sensitive when dry.