Are dating glass negatives speaking the

Photographic plates preceded photographic film as a capture medium in photography, and were still used in some communities up until the late 20th century. The light-sensitive emulsion of silver salts was coated on a glass plate , typically thinner than common window glass, instead of a clear plastic film. Glass plates were far superior to film for research-quality imaging because they were extremely stable and less likely to bend or distort, especially in large-format frames for wide-field imaging. Early plates used the wet collodion process. The wet plate process was replaced late in the 19th century by gelatin dry plates.

Store the plates vertically, on the long edge, in document boxes. Interleave every inch with corrugated board to support the plates. For plates 8 x 10" and smaller, half-size boxes are preferred as the plates can be heavy.

How to Date Antique Glass Bottles

If the box is under-filled, place sheets of corrugated board cut same size as the plates in the front and back of the box to support the plates snugly in the center. Use oversized legal boxes for plates over 10 x 12". Use full width boxes for these larger sizes due to their greater stability and reduced risk of tipping. Place a sheet of corrugated board in the bottom of the box if the plates are to be shipped for duplication. Otherwise, for routine storage, no extra padding or cushioned box is needed.

Boxes may be stacked two high, no more.

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Intact glass plates with flaking emulsion The extent of flaking, use, and value of the glass plate will dictate the housing option chosen for plates with flaking emulsion. Continue as described above.

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Broken Plates Sandwich the broken pieces between two sheets of buffered board. Place the sandwich into a four-flap enclosure. Thread Tools. Apr 5, 1.

In addition, the glass plate medium is fragile and prone to cracking if not stored correctly. Historical archives. The United States Library of Congress has a large collection of both wet and dry plate photographic negatives, dating from the through , over of which have been digitized from the period to Aug 22,   Peering inside, he saw a bunch of glass negatives and was surprised by the good condition they appeared to be in. "I used to work with negatives and these looked quite good," he told ITV. After paying ?4 (about $5) for the box of 18 negatives, he decided to see if he could coax out the images. Apr 30,   ON DATING GLASS NEGATIVES Glass negatives can date from the mid's to the mid's. I usually look at the subject matter to try to determine the date. ON MAKING PRINTS FROM GLASS NEGATIVES Making a photo from a glass negative is the same as making a photo from an equivalent size film negative.

Messages: 3, A friend of someone I know has some glass negatives. How safe is it to expose them to light for making prints? Does that depend on the method originally used? Just wondering before I get volunteered to make contact prints.

I don't want to do anything to them that would harm them. Apr 5, 2.

Dating glass negatives

Messages: 10, They should be fine for contact printing. The place you might run into issues is trying to enlarge them. In an enlarger, you run the risk of the emulsion catching fire and exploding if they are wet-plate negatives. Later dry-plate negs might just crack and flake off the glass from overheating.

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The safest thing to do is either contact print or scan and enlarge that way. Apr 5, 3.

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Apr 5, 4. Messages: 12, Ignorance was bliss in my case in that I was given glass negs which dated from the late s. I know the date of one of the negs as it was a neg of a very elderly relative of my neighbour. Based on what the Flyingcamera has said they might have been dryplate negs.

Dating antique bottles requires knowledge of the evolution of bottle technology and the ability to research manufacturers and bottling companies. Although glass bottles have been made for a few thousand years, it was not until the 19th century that bottle use became common, coinciding with the industrial revolution. Dating Glass Plate Negatives, dating games online for girls and boys, melbourne fl dating sites, hs story dating levels/ Aug 15,   Housing Glass Plate Negatives at the National Archives and Records Administration Glass Plate Handling Procedures Ensure that you are working on a clean, flat, dry surface, free of any debris. Wear non-vinyl plastic gloves when handling the plates: Latex or Nitrile, for example. Cotton can be slippery when handling glass and may snag flaking emulsion.

They looked incredibly thin and fragile but I hadn't considered the risk under the enlarger. They contact printed and enlarged beautifully with no damage. I may have been lucky.

On a plate - from glass negative to digital image

I cannot say what size they were but they were not much bigger than inches so contact printing was really too small. So really I had no choice but to enlarge for a decent size print. The earliest bottles were hand-blown by a glassblower with a blowpipe and lack seams. Is the bottle highly symmetrical, but lacking mold seams?

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This type of bottle was probably dip-molded and dates after circa Is the base indented with an irregular to round pontil scar? This, and no mold seams, is another indication of a hand-blown bottle. A pontil rod held the nearly molten bottle during the final stages of manufacture. The scar was left when the pontil was detached from the bottle. Look for side mold seams. If the seams disappear in the neck, the bottle was probably "blown-in-mold" and dates circa to early s.

Is a pontil mark present along with disappearing side mold seams?

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This bottle probably dates circa to Do the mold seams disappear in the neck, but the bottle lacks a pontil mark? Blown-in-mold bottles without pontil marks date circa s to s.

Glass plates that are not broken or flaking

Do the mold seams go all the way from the base to the lip? This is a machine-made bottle and dates after Look for a "suction" scar on the base.

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This will be shallower, wider and more perfectly circular than a pontil mark.

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