falotico
Member
- Joined
- Aug 31, 2012
- Messages
- 265
- Format
- 35mm
I had a chance yesterday and today to go to Rochester, NY and visit with Photo Engineer, Ron Mowrey. We had wonderful conversations (among other talents he can speak Japanese, French, German, Russian, and some Greek) and I showed him some dye transfer tests made by Technicolor in the 40s and 50s.
On the subject of dye transfer I mentioned a patent from 1950 that Kodak owned which described a process to dye tanned gelatin on the basis of isoelectric point. The inventors of the process were David Dean and Robert Houck--Patent number 2,529,922. They discovered that acid dyes would stain tanned gelatin if the dye solution had a Ph lower than the isoelectric point of the gelatin. The isoelectric point of gelatin could be lowered if the image was developed by a tanning developer such a pyrogallol. Similarly, basic dyes would stain gelatin if the dye solution Ph was greater than the isoelectric point of the gelatin. The whole concept seems promising.
Photo Engineer and I talked of many things from the Mercury Program to his interactions with the executives from Kodak. Did you know that Kodak had bins the size of a room that were filled with dye couplers? You could shovel out pounds of the color you needed into a bucket.
I will post a photo when I get back to my regular computer.
On the subject of dye transfer I mentioned a patent from 1950 that Kodak owned which described a process to dye tanned gelatin on the basis of isoelectric point. The inventors of the process were David Dean and Robert Houck--Patent number 2,529,922. They discovered that acid dyes would stain tanned gelatin if the dye solution had a Ph lower than the isoelectric point of the gelatin. The isoelectric point of gelatin could be lowered if the image was developed by a tanning developer such a pyrogallol. Similarly, basic dyes would stain gelatin if the dye solution Ph was greater than the isoelectric point of the gelatin. The whole concept seems promising.
Photo Engineer and I talked of many things from the Mercury Program to his interactions with the executives from Kodak. Did you know that Kodak had bins the size of a room that were filled with dye couplers? You could shovel out pounds of the color you needed into a bucket.
I will post a photo when I get back to my regular computer.