hypo–alum toning process
Definition of hypo–alum toning process
: a method of altering a developed silver photographic image to a sepia color by means of a warm solution containing essentially hypo and alum
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Origin and Etymology of hypo–alum toning process
hypo + alum
Seen and Heard
What made you want to look up hypo–alum toning process? Please tell us where you read or heard it (including the quote, if possible).