Discussion in 'Film and Processing' started by eli_fedele, Dec 21, 2011.
When this question came up, and someone posted the chemical names for the couplers,
I asked someone at Alfa chemical for the prices. It seems that one is in the catalog, but they
don't stock it. They synthesize it when you order, for hundreds of dollars per gram.
The other two, they would have to get a quote for, again would by synthesized to order,
and likely much more than hundreds of dollars per gram. They never wrote
back with the quote for them. It might be because I told them I
Just a random guess that you might want 10g of each, for maybe $10,000.
The reexposure has to be the right intensity and time.
The process is worked out such as not to give so much exposure that the
wrong layer is developed. The sensitizing dyes have enough overlap that
you can't just saturate it, except for the last one.
The green sensitive layer has to be done chemically, as there is silver in the other
two layers at that point, which would block the light.
The rear red, and front blue, exposure are done only from that side.
I suppose you could take it off the reel, put it against something black,
and expose with just the right intensity and time.
As a first try, one might want 100g of each coupler, maybe $300,000 or so?
It will take many hours of work, but doing it for the fun of it, one doesn't
worry about that. But I don't have $300,000 to put to the cause.
Note that chemical supply companies normally quote and supply
reagent grade chemicals, which are fairly pure.
There is a lower grade that chemical suppliers generate, called technical
grade, which is, for example, used for cleaning solvents. You buy techincal
grade alcohol to burn in alcohol stoves.
There is a lower grade that most don't even know about, which is photographic
grade. That means that it isn't very pure, but has only a small amount of certain
chemicals that interfere with processing. No chemical supplier will know how
to supply photographic grade couplers, but might be in the $/g range, if
Why has this 9 year old thread been revived?
I think all that there is to be said about the impracticality of home processing Kodachrome has already been said.
By the way, for those wanting to try old color photography processing,
there is an E4 kit on eBay.
It isn't so hard to find E4 film, though it might be 40 years old.
It is very strange though.
Note that there are 5 pages, but nothing on pages 2 through 4.
Or maybe it is just me.
That's happened to many of the pre 'new look' threads. Not sure why. I suspect it has something to do with a revision of the posts-per-page limit..... or something.
I still don't understand why somebody would revive a decade-old thread just to add a meaningless comment.
I am not sure why, either, but it reminded me that I hadn't finished this.
In 2015, so not from this thread, I asked Alfa about some chemicals.
For 2-benzoyl-2'-methoxyacetanilide, one of the couplers, which it seems
is an ordinary stock item, they quoted $495 for 50mg, or about $10,000/gram.
I thought about asking again for the others, which they would custom make
if ordered, but presumably they cost even more. It seemed mean to have
them quote, when it was so far from what. could afford.
It would be nice to know the actual formula for the different steps,
including how much of the couplers go in, but I suspect it is a lot
more than 50mg.
Didn't grind through the whole thread, but recalled that a while after Kodachrome was over, some folks were processing it as Monochrome. Quick internet search, and sure enough. My other recollection was that the outcomes weren't great. Never tried it myself.
Kodachrome in 2011 – Process as Black and White
Pre-Wash. Pre-wash in 20°C water for two minutes, thirty seconds. ...
Develop. Develop in Kodak T_Max developer 1-to-4 at 20°C for six minutes thirty seconds with constant agitation for the first three minutes – then agitation for ten seconds every 45 seconds until completion.
Stop Bath and Extra Rinse. ...
OK, realizing that the chance of anyone actually doing it is just a hair above zero,
does anyone know about how much of the couplers are needed to do the processing?
I will guess that, like others, one can mix up 1L and do maybe 10 rolls, so
how much for 1L?
Separate names with a comma.