Fixed out photographic papers are not recommended for double transfer since the gelatin of these papers will not normally swell enough to make contact with the image on the temporary plastic support, and this may lead to an incomplete transfer.
Double Transfer Procedure—Papers used for the double transfer procedure should be coated with a relatively soft layer of gelatin that will expand considerably when wetted.
I use potassium dichromate for tray sensitizing and ammonium dichromate for spirit sensitizing. Mix two grams of potassium alum dissolved in ml of warm water, then add about 5ml of this solution to every ml of coating solution.
When the gelatin solution has completely liquefied, stir in 50g of plain white sugar. This group of reactions is referred to as one-carbon metabolism because what they have in common is the transfer of one-carbon groups.
Add the pigment to the gelatin solution, and stir well. This is necessary for complete transfer of the image from the temporary plastic support. After three minutes remove the tissue from the sensitizer, allow it to drain for a few seconds, then place it emulsion side down on a clean sheet of acrylic plastic.
In order to reduce grain, achieve dense blacks, and prevent the highlights from washing away, my method uses two or more layers of pigmented gelatin.
Prepare the sheeting material by cutting out a frame in the material slightly larger the tissue size you wish to make.
The magnetic material will stick to the steel through the thickness of the paper with enough force to keep the gelatin from flowing, keeping it entirely confined within the frame. I am also using imagesetter negatives instead of inkjet negatives. Image courtesy of Sam Wang Spirit Sensitizing Spirit sensitized tissue dries much faster than tray sensitized tissue and is also more environmentally friendly since only a very small amount of dichromate solution is needed.
Any good quality paper may be used, depending on the final surface desired. A more contemporary example of the color stability of pigments is found in the paints used on automobiles today, which must survive intense daily exposure to very harsh lighting, under extreme conditions.
The contrast of a carbon image is controlled by matching the dichromate concentration of the sensitizer to the DR density range of the negatives: Next, place the tissue base briefly in water and then squeegee it to the galvanized steel sheet.
The paper is soaked for half an hour and hung to dry. One-carbon metabolism exists because one-carbon groups are too volatile and need to be attached to something while being processed.Carbon Paper, Magicfly 40 Sheets (9" x 13") Graphite Transfer Paper Sheets for Tracking on Wood, Paper, Canvas Black Product - Carbon Transfer Tracing Paper for Woodworking Patterns (5 sheets - 26" x 42" per sheet).
Product Features The carbon transfer paper work on many surfaces, pattern or images onto.
Carbon transfer definition is - a photographic print made by the carbon process. a photographic print made by the carbon process See the full definition.
JOIN MWU Gain access to thousands of additional definitions and advanced search features—ad free! JOIN NOW. This group of reactions is referred to as one-carbon metabolism because what they have in common is the transfer of one-carbon groups.
One-carbon metabolism exists because one-carbon groups are too volatile and need to be attached to. A carbon print is a photographic print with an image consisting of pigmented gelatin, Some companies produced small quantities of carbon tissue and transfer papers for monochrome and three-color work until around Overview and.
The carbon transfer process is considered by most persons who know it to be one of the most beautiful of all photographic processes.
Carbon prints are capable of a wide range of image characteristics, they can be virtually any color or tone, and the final image can be placed on a wide variety of surfaces, including glass, metal, paper, as well.Download