Aisaika Ōya stone conservation bag for fruits and vegetables

Ōya stone is an igneous rock, created from lava and ash, made famous by the use made of it for the facade of the Imperial Hotel by Frank Lloyd Wright in Tokyo. One of the reasons this stone was used is because it has a warm texture and can be easily carved, allowing for a lot of versatility 1. Fireproof, Ōya stone can have different colors.
The Ōya stone is found only in an area of ​​4 km from east to west by 6 km from north to south around the city of Ōya near Utsunomiya in Tochigi prefecture where there are reserves of some 600 million tonnes
Aisaika is a polyethylene bag that preserves the freshness of fruits and vegetables by means of the absorption and permeation of ethylene, which is the accelerating hormone of senescence generated by fruits and vegetables.
For adsorption and permeation of ethylene, Ōya stone powder is mixed with polyethylene.
Aisaika consists of a polyethylene film containing sprayed Ōya stone. Ōya stone is porous and these holes are effective for the adsorption and penetration of ethylene gas which promotes the growth of vegetables. As the film is treated so that the generation of water inside a bag is reduced by keeping the gas permeation performance adequate, the growth of the bacteria responsible for the decay is delayed.
This bag knows a huge success near the individuals and professionals in Japan.