 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
| PhotoKB HomeDiscussion Groups Digital Photography Digital PhotoDSLR CamerasZLR CamerasPoint & Shoot CamerasFilm Photography 35 mmLarge FormatMedium formatDarkroomFilm and LabsOther EquipmentPhoto Technique Nature PhotographyPeople PhotographyTechnique GeneralGeneral Photo Topics General TopicsAustralian PhotographyUK PhotographyDirectoryPhoto Clubs |
Photo Forum / Film Photography / Darkroom / May 2007DOUBLE TONING (Dual Sepia) 1939
April 28, 2007, from Lloyd Erlick, I've been looking at my stash of boxed up old books ... (no guarantees that this formula works on current materials, or ever did, for that matter) ... regards, --le ________________________________ Lloyd Erlick Portraits, Toronto. website: www.heylloyd.com telephone: 416-686-0326 email: portrait@heylloyd.com ________________________________ [from "Fortunes in Formulas" by Hiscox and Sloane, Norman Henley Publishing, 1937-1939.] DOUBLE TONING (Dual Sepia): Here is a toner that will give two shades of different browns in the one picture, and the effect is very pleasing. Make a solution of one-half ounce chromic acid in 10 ounces water. Place the print in this solution until it nearly fades out (about a minute or so). Wash the print in running water and then place the print in ordinary film developer (M.Q.) and redevelop back to visibility. This formula takes the place of the old time sulphide print for rich browns. Unlike the old time sulphide process the above is odorless and less liable to produce insoluble stains. > April 28, 2007, from Lloyd Erlick, > [quoted text clipped - 34 lines] > odorless and less liable to produce insoluble > stains. One can get a similar effect by using Potassium Ferricyanide bleach and in normal Sepia toning. The bleach affects the size and shape of the silver crystals so that they are sometimes more warm toned after redevelopment but the effect depends on the emulsion. One great drawback to this method is that the final image is metallic silver so it is not protected from oxidation as is the silver sulfide image from the usual sulfide toning. If split tones are desired they can be gotten by partial bleaching in normal Sepia toner. The darker parts of the image will retain a lot of silver so will be toned less than the highlights. Interesting effects can be gotten by a subsequent toning in a "direct" toner, for instance two shades of Brown. Also, a sulfide image treated in a Gold toner will turn some shade of red. So, if a partially toned image is treated in Gold the highlights will become red or reddish brown and the shadows will become blue. Since both sulfide and Gold are effective in protecting the image such a split toned image will be quite permanent although a final fixing step is probably a good idea. Note that using a Bichromate bleach followed by redevelopment in a standard, active, developer is essentially the same as chrome intensifier.  Signature--- Richard Knoppow Los Angeles, CA, USA dickburk@ix.netcom.com > April 28, 2007, from Lloyd Erlick, > [quoted text clipped - 34 lines] > odorless and less liable to produce insoluble > stains. An addendum: the chromic acid bleach will leave a stain which can be cleared by treating the print in a bath of Sodium Sulfite and subsequent washing. Kodak Hypo Clearing Agent, perhaps a little stronger than normal working solution, will work fine as a clearing bath. Signature--- Richard Knoppow Los Angeles, CA, USA dickburk@ix.netcom.com >April 28, 2007, from Lloyd Erlick, > [quoted text clipped - 34 lines] > odorless and less liable to produce insoluble > stains. That is a bleach without the bromide. The bleach can be done with the more usual ferricyanide although the end results are not likely the exact same. With the later the compound created is silver ferrocyanide; with the acid ?. With both and carried out with the lights on, either of the silver compounds are ready for a developer or a sulfide or some other intermediate treatment. Now days, IIRC, some dichromate would be used although for "two shades of different browns" the acid may be needed. Dan > >April 28, 2007, from Lloyd Erlick, >> [quoted text clipped - 51 lines] > for "two > shades of different browns" the acid may be needed. Dan I don't exactly know what this ancient book means by "chromic acid". A dichromate bleach made with Hydrochloric acid will convert the silver to Silver Chloride, which can be redeveloped. This is in fact Chromium intensifier. Of course, the image could be redeveloped in Sodium Sulfide resulting in a silver sulfide image the same as conventional Sepia toner, but likely of a different shade. Chromium intensifier is simple, here, for example, is Kodak In-4 Kodak In-4 Chromium Intensifier Stock Solution Potassium Bichromate 90.0 grams Hydrochloric Acid 64.0 ml Water to make 1.0 liter For use dilute one part stock to 10 parts water. The negative should be hardened in a Formaldehyde hardener before treatment. Treat the negative until the image is completely bleached out. Then wash for 5 minutes. Then redevelop in strong artificial light or daylight in a rapidly acting, low sulfite, developer. Dektol or D-72 diluted 1:3 is a good choice. Full redevelopment may take 10 minutes. Then rinse and fix for 5 minutes. Then wash thoroughly. The process can be repeated. Images resulting from Chromium intensification may not be completely permanent. Signature--- Richard Knoppow Los Angeles, CA, USA dickburk@ix.netcom.com >April 28, 2007, from Lloyd Erlick, > [quoted text clipped - 34 lines] > odorless and less liable to produce insoluble > stains. That is a bleach without the bromide. The bleach can be done with the more usual ferricyanide although the end results are not likely the exact same. With the later the compound created is silver ferrocyanide; with the acid ?. With both and carried out with the lights on, either of the silver compounds are ready for a developer or a sulfide or some other intermediate treatment. Now days, IIRC, some dichromate would be used although for "two shades of different browns" the acid may be needed. Dan Is the the same stuff named in http://www.cdc.gov/niosh/npg/npgd0138.html ? I was interested in giving it a try, until I read the cautions! Or am I just a worrier? D > >April 28, 2007, from Lloyd Erlick, >> [quoted text clipped - 45 lines] > Now days, IIRC, some dichromate would be used although for "two > shades of different browns" the acid may be needed. Dan > Is the the same stuff named in > http://www.cdc.gov/niosh/npg/npgd0138.html ? > I was interested in giving it a try, until I read the > cautions! > Or am I just a worrier? > D I am rather skeptical of the formulas in _Fortunes in Formulas_, many are very old and use non-standard terminology and may be sloppy about chemical names. I suspect the substance used in the formula posted is Potassium dichromate, there is an MSDS for this at: http://www.jtbaker.com/msds/englishhtml/p5719.htm Its no safer than Chromic acid. Potassium dichromate is used for a number of photographic purposes, for instance, tray cleaner, a bleach to remove metallic silver but not undeveloped halide (as in reversal processing), and as a senstizer for processes like Carbon and gum that depend on differential hardening. It can be used for toners but one can get similar results with much safer materials. If you want to double tone one simple way is to use conventional "Sepia" toner removing the print from the bleach before bleaching is complete. This will leave the darker areas untoned. You can subsequently tone them in another type of toner. For instance, a Gold toner will tone the Sepia part red and the silver part blue. Other toners, like Liver of Sulfur (Kodak Brown Toner), or Selenium toner (Kodak Rapid Selenium Toner) will tone the silver part some other shade of brown than the Sepia part. There are many other variations. A good source for information are Tim Rudman's books, _The Photographer's Master Printing Course_ and _The Photographer's Toning Book_. You might also want to look at his book on lith printing. This is an application of lithographic developers to printing paper which produces interesting effects which can not be duplicated any other way. Signature--- Richard Knoppow Los Angeles, CA, USA dickburk@ix.netcom.com |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.