Method and apparatus for controlling activity of developing solu

Radiation imagery chemistry: process – composition – or product th – Post imaging processing – Physical developing

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430 30, 356443, 250559, G03D 302

Patent

active

044640366

ABSTRACT:
A method and apparatus for controlling the activity of a developing solution against blackening by using a test piece for use in an automatic developer are disclosed. A difference between a standard density measured at the predetermined point of the first test piece developed in a standard developing solution, and a density measured at the same point of the second test piece of the same type as the first test piece as said predetermined point of the first test piece, developed in a developing solution to be controlled, is obtained. Then, a predetermined factor is multiplied by the thus obtained density difference to obtain a control value, and then the activity of the developing solution is controlled according to the control value, such as adding a supplementary solution against the blackening to the developing solution to be controlled or putting an exposed film into the same. A permissible density difference range may be determined, in which no activity control is performed.

REFERENCES:
patent: 1895760 (1933-01-01), Hunt
patent: 3636851 (1972-01-01), Furst
patent: 3995959 (1976-12-01), Shaber
patent: 4293211 (1981-10-01), Kaufmann
patent: 4365895 (1982-12-01), Shaber et al.

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