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Why are bogies green?

Why are bogies green?
Y2B from Swansea (Age: 5-14)

Why are our bogies green?
Anisah from West Yorkshire (Age: 5-14)

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4 Responses

  1. Phelegm and snot (and hence boggies, which are dried snot) can appear in a variety of colours. They tend to go green as a result of infection.
    White blood cells, called neutrophils, are sent to the nose in repsonse to a cold, for example, where they fight the infection. These specialized cells contain enzymes that generate antiseptic chemicals that can kill the invading organism. In order to function properly, some of these enzymes require iron (ferrous form) and it is the iron that colours snot green. An example of such an iron containing enzyme is myeloperoxidase.

    For a fuller explanation see : http://www.thenakedscientists.com/HTML/articles/article/science-of-snot/

  2. Phlegm and snot (bogies are simply dried snot), can actually come in a variety of colours, depending upon the health and environment of the individual (mine once went a loverly shade of dark grey after a day in London). Green, tends to be an indication of an infection.
    When the body fights a cold for example, white blood cells, called neutrophils, are sent to the nose to kill the invading virus. These specialised cells contain enzymes that produce antiseptic chemicals. Some of these enzymes need iron (ferrous form) in order to work properly and it is this that gives snot its green colour. One such iron containing enzyme is myeloperoxidase. This enzyme produces an antiseptic chemical called hypochlorous acid; the type of bleach often used in swimming pools.

    For a fuller explanation see:
    http://www.thenakedscientists.com/HTML/articles/article/science-of-snot/

  3. Wow That Was Amazing Im Only 9 And i want to be a scientist now

  4. Phlegm and snot (bogies are simply dried snot), can actually come in a variety of colours, depending upon the health and environment of the individual (mine once went a loverly shade of dark grey after a day in London). Green, tends to be an indication of an infection.
    When the body fights a cold for example, white blood cells, called neutrophils, are sent to the nose to kill the invading virus. These specialised cells contain enzymes that produce antiseptic chemicals. Some of these enzymes need iron (ferrous form) in order to work properly and it is this that gives snot its green colour. One such iron containing enzyme is myeloperoxidase. This enzyme produces an antiseptic chemical called hypochlorous acid; the type of bleach often used in swimming pools.
    For a fuller explanation see:

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