Storage of glass negatives

These are the advised values for temperature and RH for storage of
glass plate negatives that I found in literature, but I was
wondering which one is the correct one? It is confusing.

            Temperature in degrees Celsius      RH in %

    ANSI                                20 - 50     15 - 25
    Insituut Collectie Nederland        40 - 50     15 - 20
    Haas                                30 - 50     18 - 21
    Hendriks                            35 - 40      max 21
    Kodak                               25 - 50      max 21
    Lavedrine                                40     18 - 21
    Eaton                               40 - 50      max 21
    Ostroff                             25 - 35      max 21
    Gillet                              30 - 45     10 - 16
    McCabe                              30 - 35     10 - 16
    National Library of Australia            35           8

Rob Heesterbeek, student of the Reinwardt Academie


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                  Conservation DistList Instance 13:46
                  Distributed: Tuesday, March 7, 2000
                       Message Id: cdl-13-46-020
                                  ***