The powder was wetted to
aw 0.8 by adapting the methods described by Coskun,
Yalcın, and O¨ zarslan (2005) Muramatsu, Tagawa, and
Kasai (2005) as follows: 0.14 g water/g powder was sprayed
using an atomiser on thin layers of powder, which were
then stored for 3 days at 5 C in a refrigerator to enable
the moisture to become uniformly distributed throughout
the sample.