PURPOSE: To retain freshness for a long period, by exposing perishables to a finely sprayed solution containing an extract of a theaceous or lauraceous plant.

CONSTITUTION: For example, about 250g dried powder of leaves collected from theaceous tea plants and about 600ml isopropanol are charged into a Soxhlet extractor and refluxed while heating for about 20hr. Raw material residues are then removed from the resultant extract solution and the filtrate is concentrated to dryness under reduced pressure. The obtained solid is subsequently used as an aqueous solution in about 0.1wt.% concentration.