| 摘要 |
1474428 Holograms AGFA-GEVAERT AG 2 Aug 1974 [4 Aug 1973] 34168/74 Heading G2X In a process for the production of light-fast holograms the gelatin recording material is hardened and sensitized with ammonium bichromate, holographically exposed, developed in a desensitizing bath containing hydroxy-methyl sulphinic acid (HOCH 2 SO 2 H), hardened in formaldehyde solution, rinsed with water, dehydrated in a first stage with aqueous isopropanol solution and in a second stage with more concentrated isopropanol solution to which formaldehyde has been added, and dried. The desensitizing bath may consist of a solution of 3 to 20 wt. per cent of sodium sulphite (Na 2 S 2 O 5 ) and 5 to 30 wt. per cent of 30 % formalin in water. The first stage of dehydration is suitably effected with at least 36%isopropanol and in the second stage with anhydrous propanol to which 3 to 10 wt. per cent of 30 % formalin solution.
|
