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snowblind
01-22-2008, 07:07 AM
Indeed. Call him "The Wizard of Oz" ;-)

snowblind
01-24-2008, 06:16 AM
Here's a question regarding that coating head: would it work to spray the emulsion rather than let it flow?

Photo Engineer
01-24-2008, 08:11 AM
No, it neither flows nor is sprayed. It is extruded.

PE

Dark Orange
02-22-2008, 05:00 AM
An update for those people still interested.

Recent efforts have been towards fine-tunining the filminator, in particular, the uneven coating caused by the bearing rumble in the coating roller.

I am pleased to report that over a beer, the builder has revealed that by simply upping the base speed from 2m per minute to 4m, not only has the banding been completely eliminated, but coating thicknesses of 50 micron wet (and apparently 3 when dry) have been consistently achieved.

I will see if I will have time this week to photograph some of the reaction chambers and emulsion preparation equipment he has built.

Dark Orange
02-23-2008, 04:51 AM
http://farm3.static.flickr.com/2312/2285792820_4970ba7773.jpg (http://www.flickr.com/photos/dark_orange/2285792820/)

:)

bdial
02-23-2008, 06:07 AM
Hmm, I never would have thought that cream cheese would be part of the formula:)

Photo Engineer
02-23-2008, 09:08 AM
I never would have thought that CLS was a necessary part of a B&W formula. Unless that is the AH layer, in which case it is sure gonna be hard to remove in a B&W process.

PE

PhotoBob
02-23-2008, 09:32 AM
Wow, this is a very interesting development for film photography.
Sure would like to know whose machine that is and how to contact him.

Dark Orange
02-23-2008, 03:33 PM
I never would have thought that CLS was a necessary part of a B&W formula.

So that would suggest what, in particular... ;)

Photo Engineer
02-23-2008, 03:35 PM
Color!

PE

Photo Engineer
02-23-2008, 03:39 PM
As an afterthought, you need couplers, solvents, about 9 emulsions, sensitzing dyes, a colloid mill, scavengers, acutance dyes, and a few more odds and ends, not to mention all of the formulas to prepare the above.

Reminds me of an old Melaine song "I have a pair of brand new roller skates, you have a brand new key". Of course the song was quite lurid in meaning, but the point applies. Having done every phase of Gold 400, I know all of the above. I also know the coating formula.

PE

Emulsion
02-24-2008, 12:26 AM
An update for those people still interested.

I will see if I will have time this week to photograph some of the reaction chambers and emulsion preparation equipment he has built.

I and I'm sure others would love to see photos of some of the reaction chambers
and other gear! Please let us know if you can add them to Flikr.

Emulsion.

CRhymer
02-24-2008, 12:49 AM
Color!

PE

Or Kodachrome.

Cheers,
Clarence

Dark Orange
02-24-2008, 04:12 AM
Or Kodachrome.

*hands Clarence a top-shelf stuffed teddy-bear*

;)

Photo Engineer
02-24-2008, 09:03 AM
Kodachrome is a subset of color. :D

I wish you good luck coating it. It can be done without all of the couplers and colloid mill, but is going to require the unique processing chemistry. And the design stages of the film are very intensive to get things right.

I hope everything works out well for you.

PE

Photo Engineer
02-24-2008, 09:22 AM
I was thinking about this.

The cyan (red senstized) layer needs to use a sensitizing dye that is retained during the first developer so that the bottom (cyan) layer can be re-exposed to red light. Since all other dyes are designed to wash out, you need a very particular dye for the cyan layer that will not wash out until the silver is bleached away.

Getting this dye is going to be a major requirement for your project.

PE

filmfabrik
02-24-2008, 09:38 AM
perhaps he is going to try the original Mannes & Godowsky Process by controlled diffusion without selective re-exposure... :D

Photo Engineer
02-24-2008, 09:40 AM
Well, after my initial OMG in response to your post, my second thought was that the coating problems will be even more severe, as the M&G method required very precise diffusion rates and therefore precise thicknesses and hardness.

PE

CRhymer
02-24-2008, 10:09 AM
Kodachrome is a subset of color. :D ....
PE

Indeed! I should have said, "Specifically Kodachrome". I too had a (much less informed) OMG reaction, and almost didn't post. However, they have been pretty much telling us that Kodachrome is their target, so I thought it would move the discussion along. At any rate, I plan to be in Rochester this summer, so I will gladly forfeit the virtual teddy-bear to you.

Cheers,
Clarence

Photo Engineer
02-24-2008, 10:12 AM
Clarence;

You must stop by!

Ron