Extremes are not the only danger fluctuations in temperature and RH can cause structural damage to the photographic supports (paper or glass) as well as to the emulsion layer. This causes physical degradation such as curling of photographs and flaking of emulsions. Extremely low relative humidity may lead to desiccation and embrittlement of certain photographic materials.Pest management and mold remediation start with maintaining the appropriate environment. The combination of high RH and high temperature encourages mold growth and insect activity.High relative humidity provides the moisture necessary for harmful chemical reactions, leading to much of the fading, discoloration, and silver mirroring visible in photograph collections.
Heat accelerates deterioration: the rate of chemical deterioration of most photographic materials doubles (approximately) with each 10☏ increase in temperature.The unique deterioration characteristics of various photo processes dictate how long they can survive. Managing temperature and relative humidity (RH) is critical for the preservation of photograph collections. Understanding the environmental and handling stipulations for photographs will slow their deterioration and enhance their stability and longevity. Concerns about permanence and stability have always been part of the history of photography. But these lines could have been written about photographs from any era-including the digital photography of recent years. This anonymous poet describes the disappointment of watching an image fade, less than ten years after the invention of photography. Resources for Town, Municipal, and County Clerks.Caring for Private and Family Collections.California Emergency Preparedness Consultations.Chapter 5: Disaster Preparedness and Response.Chapter 4: Managing Digital Audiovisual Collections.Chapter 3: Planning, Preparing, and Implementing Reformatting Projects.Chapter 1: Care and Handling of Audiovisual Collections.Fundamentals of AV Preservation Textbook.Digital Preservation Assessment Training.Fundamentals of Photograph Preservation.How Can an Assessment Benefit Your Collection?.Working with Collection Assessments and Consultations."Ready - Or Not": Cultural Heritage Disaster Preparedness Project.Collection and Item Assessments and Consultations.Preservation Assessments and Consultations.
Working with Conservation for Cultural Institutions and Government Agencies.Collection Assessments and Consultations.Conservation Services for Private and Family Collections.Conservation Services for Cultural Institutions and Government Agencies.
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