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  1. #1 Strange... 
    Forum Freshman Starry.Skies's Avatar
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    I was wondering if anything happens to products such as deodorant and soap chemically if they are left after their expiry date. I just found some soap that had an expiry date...and I do not believe that there is a need for this. Soap can't go bad or anything?! :? (I know this is a strange question.)


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  3. #2  
    Forum Senior silkworm's Avatar
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    That's a good question. I bet it's just how long they figure it takes to be exposed to moisture and air for it just to change as it normally would. I research this and let you know in a few days, I bet that's all it is though.

    Do you have a specific example to focus on?


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  4. #3  
    Forum Junior Lucifer's Avatar
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    It depends upon the product; many industrial products use a emulsionator to mix water and fats, but emulsionator won't last forever and so the mix may begin to cast off.

    Also biological products (food) are subject to low-speed unenzimatic (non-catalysed) reactions, and expiry date is calculated to reach a safe point where the amount of byproducts of slow reactions will not be noticed, or won't affect the quality of the product.

    Other products present a minimal bacterian activity and must be consumed before this activity goes out of control -this is typical for milk-based deserts, which always hold an amount of bacterias and after being pasteurized the bacterias die and liberate their enzims, which slowly but steadily catalyse the product into a fermented condition.

    Also there are slow reacitosn like oxidation (not just from oxygen, but also from humidity of the air within) which may change the properties of a product.

    And also packagings are not 100% staunch, and so a time is given to ensure minimal alteraiton of the product within. Fai, cans don't last forever as every metal is porous enough to let a minimal but steady permeation of gases... after some years, it may have changed the properties of the product being held.
    “If the misery of the poor be caused not by the laws of nature, but by our institutions, great is our sin.” -Charles Darwin
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