1. CURATIVE MEASURES

2. CHEMICAL DETERIORATION

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

4. 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.

5. 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.

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

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

8. BIOLOGICAL DETERIORATION The main curative measure is Fumigation.

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

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

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