| 摘要 |
The present invention relates to an aqueous alkaline developing solution comprising an alkaline mixture of an alkali metal silicate and/or an alkali metal metasilicate, wherein the M2O/SiO2 molar ratio of said alkaline mixture is in the range of from 0.5 to 1.2, the total content of said alkaline mixture being in the range of from 6 to 15% by weight of the total developing solution, and wherein said developing solution comprises a non-ionic surfactant and at least another surfactant selected from the group consisting of anionic surfactants and amphoteric surfactants. An alkali metal hydroxide can be optionally added to the alkaline mixture. Also claimed is the concentrated developing solution to be diluted to the desired strength.
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