The increased use of plastic bottles, jars and other containers for cosmetic and chemical specialty products, poses a new problem. The linear type of plastics of high or low density, are capable of absorbing and chemically neutralizing some important ingredients, notably perfume oils and preservatives. It has been shown that in a 90 day period, some of the most widely used plastic bottles will degrade at least 75% of the popular hydroxybenzoate type of preservative, usually sold as methyl, propyl and butyl "paraben". While most bacterial infection of cosmetics may not be of pathogens, even some of the so-called harmless bacteria create their own problems. For instance, pseudomanas aerogens, while not considered pathogenic, emits as a product of its metabolism, a very powerful and durable enzyme. This enzyme, even in very small concentration, is capable of breaking the bonds of cellulose polymers, causing a cosmetic preparation dependent on cellulose gums, to break down after a few months storag
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