The historical documents conservators are responsible for the preservation and restoration of historical documents, books and manuscripts. Besides devising and implementing conservation programmes for the collections, conservators also oversee the environmental monitoring programmes for paper artifacts stores and implement pest control programmes for paper-based materials. In connection with such, the nitrogen fumigation chamber is the equipment which the conservators will resort to for the collection disinfestation process. Also, the two enhanced suction tables in the Conservation Office allows for local cleaning/deacidification treatment or stain removal for the collections.