Photograph developing solution
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United States of America Patent
Stats
-
Apr 14, 1981
Grant Date -
N/A
app pub date -
Jun 22, 1978
filing date -
Jun 22, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A developer for black and white film comprising an active portion which includes from 16 percent to 23 percent by weight of hydroquinone, 23 percent to 30 percent by weight of a developer selected from the group consisting of Metol and Elon, 24 percent to 31 percent by weight potassium bromide and 24 percent to 32 percent by weight of sodium hydroxide such that the total percentage of these active ingredients comprises 100 percent of the active weight. Also included is a preservative portion such as sodium sulfite in amounts ranging from one-third to three times the weight of the active portion of the developer solution. Finally, sufficient water is present in the developer of this invention to provide an aqueous solution of the active portion of less than ten percent by weight active portion, based on the amount of water.
First Claim
Family
International Classification(s)
Cited Art Landscape
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