The National library offers a Conservation Clinic every two months - the next one is on the 18th of April. See the following link
https://natlib.govt.nz/events/national-preservation-office-conservation-clinic-april-18-2017
Friday, April 7, 2017
Saturday, March 25, 2017
Scanning Lantern slides
19th Century Magic lantern projector Wikipedia |
Some time ago a client approached me about digitising a collection of early lantern slides. Lantern slides are squarish glass slides that contain a mounted photographic transparency and are designed to be displayed in a magic lantern projector. Magic lantern projectors date back to the 17th Century and use a concave mirror at the back of a light source to direct the light through a lantern slide onto a lens which is adjusted to display the image on the slide onto a wall or screen. Early lantern slides were hand painted images, then later the slides were printed using either photographic or photomechanical processes.
Lantern slides are positive images made from a negative. The image is mounted on a glass plate and covered with a glass cover which is taped at the edges. Lantern slide shows were either for entertainment or educational purposes. My client's slides dated from the 1920s and were black and white photographic images her Grandfather used to illustrate a presentation he made to the Nelson Literary Scientific and Philosophical Institute. The slides and talk were about the hill tribes of Assam in north east India where he lived for some years.
Oridinary scan of image captions |
Slide Scan |
Final image |
Final image |
Final image |
Copyright Carterworks NZ
Friday, March 17, 2017
Chemical damage of photographic prints
Silvering out is caused by chemical breakdown of the silver used to form the image in 19th and 20th century photographs. The silver reacts with atmospheric contaminants such as hydrogen sulphide and peroxides leaving a bluish or green tarnish in the darker areas of the photo....
Scan by Carterworks showing silvering |
Sulphiding is where this reaction causes the photo to change from black to brown and create overall fading.
Scan by Carterworks showing sulphiding |
Over time these chemical reactions lead to a loss of photographic information or unsightly distortions and marks on the image. Luckily both these images were captured in time and have been restored by Carterworks.
Restoration by Carterworks |
Restoration by Carterworks |
The National Gallery of Australia recommends that photos should be displayed away from direct light, ideally behind UV glass and in temperatures of around 21 C and with a relative humidity of 50%. They also recommend that photos
be mounted and framed or interleaved and stored with archival quality chemically stable acid-free plastics such as polyethylene, polypropylene or polyester. Archival paper products should be neutral pH, unbuffered and lignin, sulphur and peroxide free. One sure way to determine if something is archival quality is to check if the material passes the American National Standards Institute Photographic Activity Test (ANSIPAT) .
Source:http://nga.gov.au/conservation/prevention/photos.cfm
In NZ you can get these archival storage materials for your photos and documents from:-
Conservation Supplies (online and in Havelock North) http://www.conservationsupplies.co.nz/
Port Nicholson Packaging in Wellington http://www.pnp.co.nz/archival-storage/
Copyright Carterworks NZ
Labels:
chemical damage
,
damaged photos
,
old photos
,
photo repair
,
photo restoration
,
photo silvering
,
photo sulphiding
,
photoshop.
Subscribe to:
Posts
(
Atom
)