Method for forming silver precipitating nuclei

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106 105, 106135, 106137, 252313R, 430247, C23C 302

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active

042591147

ABSTRACT:
Noble metal silver-precipitating nuclei are prepared by reducing a noble metal salt or complex in the presence of a first polymer with a Sn.degree. colloid formed by the non-aqueous borohydride reduction of a tin salt in the presence of an organic solvent for the tin salt and a nitrogen-containing metal chelating polymer. The invention is also directed to film units employing said nuclei.

REFERENCES:
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patent: 2726154 (1955-12-01), Land
patent: 2857274 (1958-10-01), Land et al.
patent: 2861885 (1958-11-01), Land
patent: 2944894 (1960-07-01), Land
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patent: 3032008 (1962-05-01), Land et al.
patent: 3284208 (1966-11-01), Land
patent: 3536488 (1970-10-01), Land
patent: 3615426 (1971-10-01), Debruyn
patent: 3615427 (1971-10-01), Debruyn
patent: 3615428 (1971-10-01), Weed
patent: 3615429 (1971-10-01), Weed
patent: 3615440 (1971-10-01), Bloom
patent: 3647440 (1972-03-01), Rasch
patent: 3730716 (1973-05-01), Land et al.
patent: 3894871 (1975-07-01), Land
Land, "One Step Photography", Photographic Journal, pp. 7-15, Jan. 1950.

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