Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/18/84; site tymix.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!allegra!oliveb!tymix!kanner
From: kanner@tymix.UUCP (Herb Kanner)
Newsgroups: net.rec.photo
Subject: Re: Free Markets and Product Quality
Message-ID: <562@tymix.UUCP>
Date: Mon, 28-Oct-85 14:09:31 EST
Article-I.D.: tymix.562
Posted: Mon Oct 28 14:09:31 1985
Date-Received: Wed, 30-Oct-85 06:16:49 EST
References: <298@tekig4.UUCP> <349@vaxwaller.UUCP> <556@tymix.UUCP> <1747@peora.UUCP>
Reply-To: kanner@tymix.UUCP (Herb Kanner)
Organization: Tymnet Inc., Cupertino CA
Lines: 41
Summary: 

In article <1747@peora.UUCP> jer@peora.UUCP (J. Eric Roskos) writes:
>> This would be professional Ciba, which I suspect is even more contrasty
>> than the amateur stuff.  You might give that a try.
>
>Why would you think that?  In general, for color materials, "professional"
>materials are of lower contrast than the consumer products; it usually
>goes
>
>	commercial > consumer > professional
>
>Just curious.
I get a lot of my good foo from a journal called Darkroom Techniques, which
started out as the hobby of the owner of a chemical supply house in Chicago
and grew from four issues a year to six issues a year.  Just about the
point where I gave up on amateur Ciba and switched to Ektachrome 22, there
was a glowing article in the mag about professional Ciba.  Nowhere in the
article was anything quantitative about contrast mentioned, but the various
adjectives regarding color appearance sounded to me like another way of
saying: "more color saturation."  I realize that color saturation and
contrast are not identical, but I think there is probably a monotonic
relationship.

Actually, I'm very curious about the process, which has one advantage and
two disadvantages in comparison to the amateur kit.  The advantage is that
the bleach is in liquid form.  That means that small amounts, e.g., 16
ounces, of solutions can be mixed up, eliminating the worry about old age
of the bleach.  The reason for the powder bleach in the amateur kit is
safety; apparently the concentrated liquid is very corrosive.  The two
disadvantages are that the working temperature, if I remember correctly, is
86 degrees for the pro stuff as against 75 for the amateur.  The other is
that a minimum purchase of chemicals and paper would come to about $100,
which is a lot to spend on an experiment.

If anyone on the net has used professional Ciba, especially if they have
also used amateur Ciba, Ektachrome 22, or both, I would love to hear about
the comparative results.

-- 
Herb Kanner
Tymnet, Inc.
...!hplabs!oliveb!tymix!kanner