Meaning of alpha paper | Babel Free

Definitions

A sensitized photographic paper that is coated with gelatin containing silver bromide and chloride, and is used for obtaining positives by artificial light.

UK, dated, uncountable

Examples

“The sheets of alpha paper which have been grained are first dipped in soft acetate remaining there for three minutes. They are dried in an oven and made ready for impregnation with hard acetate.”

CEFR level