Claims
- 1. A method of forming a high-contrast black and white silver image by use of a light-sensitive silver halide photographic material having a support and a hydrophilic colloidal layer thereon which method comprises imagewise exposing said photographic material to light and processing said exposed photographic material by a developer having superadditivity and a pH value of 8.5 to 12.5 and containing hydroquinone-metol or hydroquinone-phenidone, said photographic material containing at least one substantially non-diffusible compound capable of oxidizing hydrquinone, said substantially non-diffusible compound being selected from the group consisting of: N-chloro-p-dodecylbenzenesulfonamide sodium; N-chloro-p-nonylbenzenesulfonamide sodium; 2-dodecylbenzoquinone, 2,5-dioctylbenzoquinone; 2-dodecyl-5-methylbenzoquinone; 2-(benzothiazol-2-yl)-3-phenyl-5-dodecyl-2H-tetrazolium bromide; 2,3-diphenyl-5-(4-t-octyloxyphenyl)-2H-tetrazolium chloride; stearic peracid; palmitic peracid; tetraphenylphosphonium bichromate; tetraphenylphosphonium permanganate; tetraphenylarsonium perchromate; and a salt of an anion and a cation, said anion being selected from the group consisting of: p-dodecylbenzenesulfonic acid anion, lauryl sulfate anion, di-2-ethylhexyl sulfosuccinic acid anion, ethylpolyethenoxy sulfate anion, stearic acid anion, and said cation being selected from the group of a tetrazolium cation, a triazolium cation, 1,1'-dimethyl-4,4'-bipyridinium, 1,1'-diethyl-4,4'-bipyridinium and 1,1'-dibenzyl- 4,4'-bipyridinium.
- 2. A method of forming a high-contrast black and white silver image as claimed in claim 1 in which said tetrazolium cation is selected from the group consisting of:
- 2,3,5-triphenyl-2H-tetrazolium,
- 2,3,5-tri(p-carboxyethylphenyl)-2H-tetrazolium,
- 2-(benzothiazol-2-yl)-3-phenyl-5-(o-chlorophenyl)-2H-tetrazolium,
- 2,3-diphenyl-2H-tetrazolium,
- 2,3-diphenyl-5-methyl-2H-tetrazolium,
- 3-(p-hydroxyphenyl)-5-methyl-2-phenyl-2H-tetrazolium
- 2,3-diphenyl-5-ethyl-2H-tetrazolium,
- 2,3-diphenyl-5-n-hexyl-2H-tetrazolium,
- 5-cyano-2,3-diphenyl-2H-tetrazolium,
- 2-(benzothiazol-2-yl)-5-phenyl-3-(4-tolyl)-2H-tetrazolium,
- 2-(benzothiazol-2-yl)-5-(4-chlorophenyl)-3-(4-nitrophenyl)-2H-tetrazolium,
- 5-ethoxycarbonyl-2,3-di(3-nitrophenyl)-2H-tetrazolium,
- 5-acetyl-2,3-di(p-ethoxyphenyl)-2H-tetrazolium,
- 2,5-diphenyl-3-(p-tolyl)-2H-tetrazolium,
- 2,5-diphenyl-3-(p-iodophenyl)-2H-tetrazolium,
- 2,3-diphenyl-5-(p-diphenyl)-2H-tetrazolium,
- 5-(p-bromophenyl)-2-phenyl-3-(2,4,6-trichlorophenyl)-2H-tetrazolium,
- 3-(p-hydroxyphenyl)-5-(p-nitrophenyl)-2-phenyl-2H-tetrazolium,
- 5-(3,4-dimethoxyphenyl)-3-(2-ethoxyphenyl)-2-(4-methoxyphenyl)-2H-tetrazolium,
- 5-(4-cyanophenyl)-2,3-diphenyl-2H-tetrazolium,
- 3-(p-acetamidophenyl)-2,5-diphenyl-2H-tetrazolium,
- 5-acetyl-2,3-diphenyl-2H-tetrazolium,
- 5-(fur-2-yl)-2,3-diphenyl-2H-tetrazolium,
- 5-(thien-2-yl)-2,3-diphenyl-2H-tetrazolium,
- 2,3-diphenyl-5-(pyrid-4-yl)-2H-tetrazolium,
- 2,3-diphenyl-5-(quinol-2-yl)-2H-tetrazolium,
- 2,3-diphenyl-5-(benzoxazol-2-yl)-2H-tetrazolium,
- 2,3-diphenyl-5-nitro-2H-tetrazolium,
- 2,2',3,3'-tetraphenyl-5,5'-(1,4-butylene)-di-(2GH-tetrazolium),
- 2,2',3,3'-tetraphenyl-5,5'-p-phenylene-di-(2H-tetrazolium),
- 2-(4,5-dimethylthiazol-2-yl)-3,5-diphenyl-2H-tetrazolium,
- 3,5-diphenyl-2-(traizin-2-yl)-2H-tetrazolium, and
- 2-(benzothiazol-2-yl)-3-(4-methoxyphenyl)-5-phenyl-2H-tetrazolium.
- 3. A method of forming a high-contrast black and white silver image as claimed in claim 1 in which said triazolium cation is selected from the group consisting of:
- 1-methyl-2-phenyl-2H-1,2,3-triazolium,
- 1-n-propyl-2-phenyl-2H-1,2,3-triazolium,
- 2-(4-methoxyphenyl)-3-phenyl-2H-naphtho-[1,2-d]-1,2,3-triazolium,
- 1,5-(9,10-anthraquinolyl)-bis{2-[3-phenyl]-2H-naphtho-[1,2-d]-1,2,3-triazolium}, and
- 2,3-di(4-methoxyphenyl)-5-nitro-2H-naptho[1,2-d]-1,2,3-triazolium.
- 4. The method of claim 1 in which said salt is selected from the group consisting of 2,3,5-triphenyl-2H-tetrazolium diethylhexylsuccinatesulfonate salt, 2,3,5-triphenyl-2H-tetrazolium isopropylnaphthalenesulfonate salt and 2,3-diphenyl-5-dodecyl-2H-tetrazolium diethylhexylsuccinate-sulfonate salt.
- 5. The method of claim 1 in which said hydrophilic colloidal layer comprises gelatin.
Priority Claims (1)
Number |
Date |
Country |
Kind |
50-94295 |
Aug 1975 |
JPX |
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Parent Case Info
This is a continuation, of application Ser. No. 710,385, filed Aug. 2, 1976, now abandoned.
US Referenced Citations (14)
Foreign Referenced Citations (2)
Number |
Date |
Country |
1446226 |
Apr 1968 |
GBX |
1214982 |
Aug 1976 |
GBX |
Non-Patent Literature Citations (1)
Entry |
PPP No. 49-5333, Derwent Abstract. |
Continuations (1)
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Number |
Date |
Country |
Parent |
710385 |
Aug 1976 |
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