Claims
- 1. A black and white silver halide photographic material comprising a support having thereon at least one silver halide photographic emulsion layer, wherein said silver halide emulsion layer has been spectral-sensitized with at least one spectral-sensitizer to have a sensitized peak in a wavelength range greater than 730 nm; absorbance of light due to said silver halide emulsion containing said spectral-sensitizer satisfies the following equation:
- Abs (peak wavelength)/Abs (peak wavelength-100 nm)>5;
- and said spectral-sensitizer comprises at least one imidadicarbocyanine dye.
- 2. The black and white silver halide photographic material as in claim 1, wherein the silver halide emulsion comprises a silver halide having a chloride content of 50 mol % or more.
- 3. The black and white silver halide photographic material as in claim 1, wherein said at least one spectral-sensitizer is represented by formula (I): ##STR5## wherein R.sub.1 and R.sub.2 each represents an alkyl group having from 1 to 8 carbon atoms;
- Y.sub.1 and Y.sub.2 are bonded to each other to form an atomic group for completing a benzene nucleus, or each represent a hydrogen atom, a halogen atom, a cyano group or a perfluoroalkyl group;
- Y.sub.3 represents a hydrogen atom, an alkyl group having from 1 to 4 carbon atoms, a benzyl group or a phenyl group;
- X represents an anion;
- p represents a number to be determined so that the number of cation charges and the number of anion charges in the formula are the same; and
- X may be bonded to R.sub.1 or R.sub.2 to form an internal salt.
- 4. The black and white silver halide photographic material as in claim 1, wherein said silver halide emulsion contains an organic solvent in an amount of 180 ml or less per kg of the emulsion.
- 5. The black and white silver halide photographic material as in claim 4, wherein said organic solvent is selected from the group consisting of methanol and ethanol.
- 6. The black and white silver halide photographic material as in claim 1, wherein said silver halide emulsion comprises silver halide grains having a dye-coated percentage of 50% or more based on the surfaces thereof.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3-138613 |
May 1991 |
JPX |
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Parent Case Info
This is a Continuation of application Ser. No. 08/167,220 filed Dec. 16, 1993 now abandoned, which is a continuation of application Ser. No. 07/878,453 filed May 5, 1992, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4619892 |
Simpson et al. |
Oct 1986 |
|
5057405 |
Shiba et al. |
Oct 1991 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
313021 |
Apr 1989 |
EPX |
Continuations (2)
|
Number |
Date |
Country |
Parent |
167220 |
Dec 1993 |
|
Parent |
878453 |
May 1992 |
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