1 - The constituent materials and the manufacturing technique
The knowledge of the nature of the materials and the manufacturing procedures (fig. 2) is of fundamental importance with a view to identifying the causes of the decay and to choose compatible restoration methodologies and products
- Type of seismogram
Smoked, ink, photographic, heat-sensitive
- Paper medium used
Hand-made paper, machine-made, coated paper, photographic medium...
- Type of monitoring instruments used
Mechanical seismograph, electromagnetic seismograph etc.
- Type of fixative used
Fixatives for smoked paper and related concentration, other types of fixative (e.g. chemical for photographic papers).
2 - The causes of the decay
3 - Conservation solutions
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