| 摘要 |
The use of phenazine, phenoxazine and phenothiazine color forming developers in photothermographic dry silver emulsions provides a stable imaging system under both light and dark storage. The developers are of the general formula <CHEM> in which R, R<1> to R<8> are selected from a range of organic substituents, Q is N, S, O or C, and X is carbonyl, sulfonyl, carboxyl amido or phosphonyl. |
