Toning of photographic print material
US5688635A · kind A · utility
3Cited by
5References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 6, 1996 |
| Grant date | Nov 18, 1997 |
| Priority date | — |
| Expiry date | May 6, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/46
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
There is described a photographic developing solution which comprises as an image toning agent a compound of formula I: ##STR1## where Ar is an aromatic or heteroaromatic ring which may be substituted, in a concentration of at least 0.00035 moles/liter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.