I have coated multilayer materials using our lab equivalent of AJ-12. We coated 6 layers. It is a matter of practice and attention to gelatin and other chemical "load".
PE
Or, if paper, to create a VC paper with emulsions of 2 different contrasts but the same speed.
im not PE and i have no clue ..That is the way Ilford describes their VC paper: several layers, sensitive to different wavelengths of light (blue and green). What has me puzzled is the VC Emulsion by Rollei/Maco: They have a VC liquid Emulsion which comes in one container, so you coat only one layer. How is that made? Can you mix 2 emulsions with different sensitization and thereby get a"combined" result similar to coating two layers?
Yes, you can mix emulsions in a VC paper, but you have to face up to several problems associated with keeping.
PE
I was wondering about how to keep the sensitiser from "cross-contaminating" in the mixture.
Agfa solved this issue.
No, that is industry standard.As far as I know Agfa developed a system of symultaniously coating various layers, right?
As far as I know Agfa developed a system of symultaniously coating various layers, right?
But actually I was not refering to coatings made on an industrial scale, but literally to the Foma VC-Emulsion sold in a plastic container to hobbyists. Foma hardly can predict the storage and transport conditions & temperatures and storage times can be long. In the plant of Agfa / Ilford / Kodak / Adox, / ... all these variables can be controlled. The DIY-Emulsion is beyond the manufacturer´s controll once it leaves the plant.
But just the idea of variable contrast material made up of emulsions of different gradations necessitates the two respective sensitizers to stick at their grains,Then, any exchange will be essentially meaningless.
But just the idea of variable contrast material made up of emulsions of different gradations necessitates the two respective sensitizers to stick at their grains,
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