| Cena: |
| Stanje: | Polovan bez oštećenja |
| Garancija: | Ne |
| Isporuka: | AKS BEX City Express Pošta CC paket (Pošta) DExpress Post Express Lično preuzimanje |
| Plaćanje: | Tekući račun (pre slanja) Ostalo (pre slanja) Pouzećem Lično |
| Grad: |
Novi Sad, Novi Sad |
ISBN: Ostalo
Godina izdanja: Ostalo
Jezik: Engleski
Oblast: Fotografija
Autor: Strani
lepo očuvano
Early photographic image deterioration is primarily caused by oxidation of the silver image and degradation of the support material, driven by factors like chemical residues from poor processing, environmental pollutants, and unsuitable storage conditions such as high humidity, heat, and light. The conversion of silver to compounds like silver sulfide leads to discoloration (yellowing) and fading, while acid degradation from the paper can cause brittleness and staining.
Chemical and physical deterioration mechanisms
Image oxidation: The silver particles that form the image can react with oxygen and pollutants to form compounds like silver sulfide, a brownish-yellow substance that causes a loss of image density and a change in color.
Sources of sulfur: This reaction can be triggered by sulfur compounds from atmospheric pollution, or from residual fixer in improperly washed prints.
Migrating silver: The silver particles themselves can break down, with silver atoms migrating to form smaller particles, which leads to a gradual warming and fading of the image.
Support material degradation:
Acidic paper: Paper supports can degrade due to residual acids from processing or from airborne pollutants like sulfur and nitrogen oxides, especially in damp conditions.
Iron-catalyzed oxidation: Iron salts, left behind from improper clearing baths, can catalyze the oxidation (breakdown) of cellulose fibers in the paper, a process that creates damaging free radicals.
Physical stress: Fluctuations in temperature and humidity can cause the materials to expand and contract, leading to distortion, physical stress, and curling.
istorija fotografije sve o fotografiji fotografisanje