Footnote:
Hinweis: Link zur Erstveröffentlichung URL: https://doi.org/10.1515/res-2018-0002
Description:
Traditionally papyrus fragments are stored between glass panels in many
museum collections. In most exhibits a white precipitation is formed on the inner
surface of the glazing which complicates reading and digitalization. With the help
of the present study the question of the origin and possibilities for avoiding these
precipitations should be answered. It could be shown that the precipitations
consist of the salts sodium chloride and sodium nitrate. The chloride and nitrate
ions for the salt formation stem from the papyrus whereas the sodium ions are
dissolved from the float glass. By the use of higher-quality glass such as borosilicate glass this process can be prevented or at least slowed down. Furthermore a
storage of the exhibits at relative humidities below 70 % is recommended.