Definition of reversal process in US English:

reversal process

noun

Photography
  • A process by which reversal is accomplished; especially a development process which gives a positive transparency directly from an exposed film or plate, without an intervening negative stage.

verb

Photography
  • with object To develop (a film or plate) using a reversal process.

Origin

Early 20th century<br>1960s; earliest use found in U.S. Patents.