In compliance with the American mother's demand for maximum convenience in feeding her infant, baby food manufacturers have introduced screw cap closures for jars containing infant foods. These caps permit easy opening and reclosure, which mothers like, but also present a potential health hazard.
Experience shows that some people, unaware of, or indifferent to, the dangers of bacterial contamination, open jars of baby food in the store, sometimes taste them, and return them to the shelves. Contaminated jars then present a hazard. Manufacturers have devised means of indicating whether or not a jar has been opened but safety can be achieved only if the consumer is aware of these and makes proper use of them.