in a controlled atmosphere, e.g. partial vacuum, comprising only CO2, N2, O2 or H2O

Full Title

Preservation of fruit or vegetables; Chemical ripening of fruit or vegetables > Preserving or ripening with chemicals not covered by group A23B7/08 or A23B7/10 > in the form of gases, e.g. fumigation; Compositions or apparatus therefor > in a controlled atmosphere, e.g. partial vacuum, comprising only CO2, N2, O2 or H2O