In the case of TMax films, the emulsion contains a higher percentage of silver iodide which is harder to dissolve than the other halides and so takes longer. I would not be surprised if Ilford's Delta films are similar in that regard. Determining the clearing time is easy with a clip test. Take a small piece of undeveloped film and upon it place 1 drop of fixer. Let it sit undisturbed for 30 seconds, then immerse the film chip into the fixer. When you can no longer distinguish the spot where you placed the initial drop, the film is clear. Double that time for your minimum fixing time and you're done.
...OK, my next question is, will modern tech grain films exhaust fixer quicker then conventional?
Simple answer. Yes thy do. Expect about a 35 to 40 percent reduction in capacity.
... Do you think I should get one of Kodak's T-Grain films, one of Ilford's Core Shell films, or a Fuji Epitaxial Sigma Crystal film?
as it is the thickness that denotes whether it is a T-Grain, not the shape of the grain.
Oh yeah, this page at Harman Technology is illuminating.
... people ask for a Coke and get served Pepsi
Ian
What a tempest in a pot of tea!
T-Grain by any other name is still Tabular Grain. These grains are very large in one dimension and very thin in another. There are twinned crystals which are basically 2 T-grains fused together, and there is epitaxy which is something stuck on the corners of the crystal, by any means convenient. Kodak and Fuji have both used this.
Other grains are cubic and octahedra. These describe the crystal habit, ie, cube or octahedral. There are also rounded cubes and octahedra, achieved by etching real cubes and octahedra with silver halide solvents. Then there are "K" grains or clunkers as we called them. These have no specific shape and resemble a mix of sand and gravel.
Any of the above can be core shell meaning that the core is one thing and the outer surface is another. You can also have a graded emulsion in which the core gradually blends into the surface. Oh, and y'all forgot to mention converted emulsions where one type of crystal is converted into another placing stress on the structure to gain internal and external speeds for direct reversal.
The one key is that as size and iodide content goes up, the crystal dissolves more slowly in hypo. As addenda on the surface goes up, the crystal dissolves more slowly in hypo. Thus, a highly sensitized, highly antifogged high iodide crystal of any shape will dissolve very slowly in hypo. It is just a fact that T-Grains with high iodide content are also high speed modern grain types and dissolve more slowly.
And, a T-Grain can be a hexagon, a triangle or any shape, as it is the thickness that denotes whether it is a T-Grain, not the shape of the grain.
PE
No, I think you should get a Pepsi, but don't call it Coca Cola.
Actually, all of these are probably carbon replicas of the originals. EM and SEM photos are generally done that way.
Too much work and not needed for SEM imaging.
For TEM perhaps.
Practically every Kodak Electron Micrograph is a carbon replica.
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