Abstract: There is disclosed a method for inspecting leakage of a sealed container which is effectively used for detecting a leaking place such as a pin hole, crack, etc. of a sealed container which contains foods, pharmaceuticals, chemical industrial products, etc. A method for inspecting leakage of a sealed container according to the present invention comprises changing an internal pressure of a vacuum chamber provided with an eddy-current displacement sensor to a predetermined degree of vacuum from a normal pressure after putting a sealed container to be inspected having a conductive material on at least at a portion of the container in the chamber; detecting an amount of expansion of the sealed container at the degree of vacuum in time sequence by the eddy-current displacement sensor; and determining any change in the amount of expansion after a time when the detected amount of expansion shows the maximum value, thereby to determine any pin hole formed in the sealed container.

Abstract: Green salmon roe, whether it is very fresh or less than fresh, is salted under agitation in a saturated aqueous solution of salt containing a nitrite and being free from any precipitates, and is then dehydrated. The roe thus salted is immersed under agitation in a saturated aqueous solution of malate containing a nitrite and being free from any precipitates. The roe thus processed is worked up in the conventional manner.