MirkoBoeddecker
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Our emulsion research in Bad Saarow is now really up and running. All components have been activated.
This week we completed the first Polywarmtone single emulsion.
This means it has been filled, matured, stabilised and sensitised.
This is the hard gradient.
Below you can see a comparison with the original PW (hard-exposed, developed together).
The higher density of the original does not reflect a necessary real difference in sensitivity, as we are comparing a transparency wedge (our sample) with a paper print (original).
Consequently, during exposure (reflection from the substrate), the amount of light exposed has a greater effect.
We estimate that there is still a difference of approximately 2 DIN.
(The grey wedge runs in 2 DIN steps).
What we cannot measure is a possible difference in the silver coating.
In fact, the entire layer structure is still missing.
So what does this wedge tell us, or where do we stand?
We can see that we:
1) Can produce an emulsion true to the formula that works photographically and is sensitive to both hard and soft filtered light under the enlarger
2) Can produce a very comparable gradient
3) Are almost there in terms of speed
4) Can produce multigrade (you can’t see this on this wedge but on the many others here ;-)
5) Last but not least: That we have a very good warm-tone effect.
The warm-tone effect would actually need to be reduced again now to match the original.
This is feasible and will likely sort itself out as we continue to optimise.
However, we should also consider whether we shouldn’t keep this one...... ;-)
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