There are indications that these dusts may find further use in more novel treatment methods, such as in association with aeration systems. For example, in Australia, Dryacide is applied as a thin surface coating to grain in silos for enhancing the effect of fumigation with the SIROFLO system (Winks, 1993). The dust, added at 100 g/m’, acts as gas barrier, reducing the rate of loss of gas through the top layers of grain so allowing open topped silos to be fumigated successfully