This parasol, designed to protect a lady's fair complexion
from the sun, was never out in the rain. Nevertheless, it shows
staining from too much moisture, which collected in the folds
of the fabric when the parasol was stored in an attic or basement
with temperature and humidity levels that changed constantly.
The parasol is also faded from too much exposure to light.
Temperature and relative humidity both affect textiles. High
humidity and temperature encourage mold and mildew growth as
well as speed up chemical deterioration. Low humidity and temperature
levels can dry out organic fibers and make them brittle. Furthermore,
frequent and rapid changes in both temperature and humidity are
even more harmful because most organic materials cannot react
quickly to the wide fluctuations.