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Thread: Strange...

  1. #1 Strange... 
    Forum Freshman Starry.Skies's Avatar
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    Apr 2006
    The Universe is really big...but I'm somewhere out there.
    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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    Nov 2005
    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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    Jan 2006
    Close to 290125001
    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.
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