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