This article is the second of two concentrating on the conservation of audio‐visual materials. This paper focuses on the conservation of one particular form of A‐V material, magnetic materials, which can be used for sound recording and for optical recording in film and television. An historical account of the development of the use of magnetic media in radio, television and film applications accompanies practical insights in to the conservation requirements of the medium. The companion piece to this article focuses on the conservation of photosensitive film materials, and can be read prior to this first paper.
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