Describe certain basic considerations for preservation of non-book materials.

Preservation and conservation of non-book materials in libraries are crucial for ensuring that these items remain accessible and intact for future generations. Non-book materials can include a wide range of items such as manuscripts, photographs, maps, audio-visual materials, and digital content. Each of these materials presents unique challenges and requires specific strategies for preservation. Here are some fundamental considerations for their preservation:

### 1. Environmental Conditions

One of the most critical aspects of preserving non-book materials is controlling their environmental conditions. The stability of items like photographs, manuscripts, and audio-visual materials can be greatly affected by temperature and humidity. 

- Temperature: Most non-book materials should be stored in a controlled environment where the temperature is kept constant and low. For instance, photographs and film materials are particularly sensitive to heat, which can ____ ________ ______ _____ _________.
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