Re: Kodak Hie Dev.

[eml@xxxxxxxxx]

> 
> On Sat, 21 Sep 1996 01:47:28 +0100, George Smyth wrote:
> 
> |I will assume that you meant EI200 above.  If you are really shooting at
> |EI2000 then you're in uncharted territory.  The high contrast you
> |mentioned was probably due to the D19 developer.
> 
> In some old literature I note that Kodak once listed a D-19a (D-19
> plus a couple of user-added ingredients) as the developer to use if
> you want absolutely highest possible film speed.  I know Bobbi really
> meant ASA 2000, as stated, and I wonder whether that rather
> extraordinary speed was at least in part a result of her using D-19.
> The other possible explanation is that her TTL metering is relatively
> insensitive to IR and thus must be hypersensitized, so to speak, in
> order to get an appropriate reading.  The question is, how much should
> she continue to allow for her camera, and how much should she cut back
> to allow for a possible speed loss in switching developers?
> 
> Once again, I guess the only responsible answer is: Test and find out.
> 

It's SD-19a that you're probably referring to.  The added ingredients
were Hydrazine salt, either Hdrazine Hydrochloride or Hydrazine 
Sulfate, and Kodak Anti-Fog #2, also known as 6-Nitrobenzimidazole
Nitrate.  These were mixed separately and added just before use.
Peterson's published a magazine-sized booklet maybe 20 years ago, 
with the results of a ton of tests with different developers and
a number of common films, including densitometer plots for all of them.
In SD-19, Kodak Tri-X 35mm film produced a real Exposure Index of
either 3200 or 6400, I forget which!  The speed winner at that
time was High Speed Ektachrome (ASA400 normally), which with processing
in, I think, one of the Perfection developers, produced auseable
shadow speed, according to the book, of 20,000!

If I can ever find the %#$&@# thing, I'll report the correct
title and publication date, as well as the SD-19A formula.

Hope this helps at least a bit.

Ed Lukacs

-- 
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Topic No. 5