| 摘要 |
1. Eradicator solution for light-hardened copying layers, which is composed of water, phosphoric acid, potassium permanganate, and a thickening agent and contains from 27 to 76 % by weight of water, 12.5 to 23 % by weight of phosphoric acid, 0.5 to 5 % b weight of potassium permanganate, 11 to 60 % by weight of the thickening agent, the thickening agent being an inorganic salt which is sparingly soluble in the solution, has a density below 4, and is capable of being hydrated in the solution. |
