|
|
|
|
|
|
 |
 |
 |
 |
 |
|
|
|
Rundbrief Fotografie
|
||
Matte Gelatine Silver Developing-Out Papers: The use of
micronized silica gels and gelatine for the partial compensation
of a matte sheen
Matte gelatine silver developing-out papers are particularly
vulnerable to mechanical damage. Friction or pressure on the
surface cause an increase in gloss. This article is a summary of a
Master's thesis on testing the extent to which gelatine solutions
with micronized silica gel additives of Syloid® ED 2 and
Syloid® 74 are suitable as matting agents, to be used for
compensation of glossy areas of damage on an original matte
surface. Also tested were three different methods of applying the
matting agent. The matting capacity of both silica gels was
compared to that of rice starch grains. The tests were evaluated
by means of instrumental gloss measurements. The optical
appearance of the treated areas of damage also played a very
important role in the assessment. The results are promising for
the restoration of mechanical damage on matte gelatine silver
developing-out papers.
Aufbau und Schädigung von matten
Silbergelatineentwicklungspapieren - Anforderungen an die
Restaurierungsmethode - Mattierungswirkung von mikronisierten
Kieselgelen in wässrigen Bindemittelfilmen - Material und
Methoden (Fotografische Testpapiere - Bindemittel Gelatine -
Mattierungsmittel - Versuchsanordnung) - Untersuchungsergebnisse
(Mattierungswirkung von Syloid® ED 2, Syloid® 74 und
Reissstärkekörnern - Eignung der getesteten
Applikationsmethoden) - Diskussion - Zusammenfassung - Danksagung
- Anmerkungen - Bezugsquellen
Questions of Assessment: The estate of amateur photographer
Johannes Weber-a historic, regional source
Preceding the transfer of the estate of amateur photographer
Johannes Weber to the picture archive of the LWL Media Centre of
Westphalia, the question of verifiable quality control of the
geographic and cultural value of the regional photographic memory
was considered a vital premise for acquisition. The two questions,
‘Does the Weber collection contribute to the photographic
memory of the region of Westphalia?’ and ‘With which
instruments and methods can a gaugeable assessment be carried
out?’, were addressed by combining two very different methods
of analysis: a rigid quality-raster relating to the history of
photography, and a dynamic comparison with previously researched
collections from the region. Oral traditions and contextualization
following the ‘oral history method’ were additionally
drawn upon.
Eine erste Erfassung und Bestandsaufnahme - Das Raster
fotohistorischer Qualitätskriterien nach Reininghaus - Die
fotohistorische Verortung (Nachlaß Walterbusch -
Nachlaß Böckenhoff - Ein Vergleich) - Mündliche
Überlieferung - Fazit - Anmerkungen
Photography for the Masses: On the early history of
photomechanical printing processes in the context of the
Photographic Society of Vienna 1864-1883 (Part II)
The intricate history of photomechanical printing processes,
which includes numerous wrong turns and disappointments, is
unfolded on the basis of the first twenty volumes of the
Photographische Correspondenz, the publication of the Photographic
Society of Vienna, founded in 1861. Following Part I in the
previous issue, this second part traces the practical experiments
and processes as well as the role of the Photographic Society in
the international discourse. The previous issue reconstructed the
early experiments of the 1860s and 1870s, namely photolithography,
photogalvanography and photoxylography, as well as the development
of the Woodburytype and the collotype. This issue examines, in
conjunction with their respective predecessors, the techniques of
photogravure and halftone printing, developed around 1880; these
brought about the final breakthrough for the illustration of
photographically illustrated books and magazines.
Heliogravure - Autotypie - Ausblick - Anmerkungen
|
|
|
|
|
