CURATIVE MEASURES. CHEMICAL DETERIORATION DEACIDIFICATION THE MAIN MEASURE IS DEACIDIFICATION Two types:  Wet or Aqueous Deacidification  Non-Aqueous.

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Presentation transcript:

CURATIVE MEASURES

CHEMICAL DETERIORATION

DEACIDIFICATION THE MAIN MEASURE IS DEACIDIFICATION Two types:  Wet or Aqueous Deacidification  Non-Aqueous Deacidification

AQUEOUS Uses solution of calcium and magnesium bicarbonate. Note: Document must first be sealed using Calatan CB dissolved in methylated spirit. Because the process uses water.

NON-AQUEOUS  Solvent Method. Uses organic solvent eg. Methylated spirit to dissolve the Calcium and Magnesium carbonate. No water is involved. Solution is brushed or sprayed on documents.

 Vapour Phase Method. A dry method which makes use of alkaline paste called Cyclohexylamine Carbonate. Neutralization takes place after 20hrs. Non Aqueous Continued…

 Gaseous Method. This is a Mass Deacidification process. It makes use of liquefied Amonia gas. Acid neutralization takes place after 36hrs. Non Aqueous Continued…

BIOLOGICAL DETERIORATION The main curative measure is Fumigation.

TYPES OF FUMIGANTS  Fungicides; o eg. Thymol, Fomaldehyde  Insecticides; o eg. Paradiclhorobenzene  Rodenticides; o eg. Cynide dust

PHYSICAL DETERIORATION The main curative measures are:  Lamination/Backing  Encapsulation  Leaf casting  Library Binding  Stain Removal

When all fail, then:  Photocopying  Microfilming  Digitizing