Welcome to Dr. B's Science Lab, a non-commercial resource for up-to-date and accurate science content, activities, and projects. Explore a different topic every month, and get the whole family involved in learning and experimenting! Just be sure to follow the directions exactly and pay attention to any safety information given.

If you would like to receive email updates whenever new content is added to Dr. B's Science Lab, submit your address in the "Follow by Email" link at left. Your email address will not be used for any other purpose.

Monday, May 31, 2010

Green Eggs??

Have you ever noticed the green film that sometimes forms around the yolk in a hard-boiled egg? It doesn't look very yummy - what is that stuff? Eggs don't start out with anything green in them! The green film is iron sulfide (chemical formula, FeS), and it forms during cooking when iron in the yolk combines with some of the egg's proteins. You can't taste it, and it's not dangerous to eat.

How can you avoid forming this green film? You need to cool the eggs quickly after they are done cooking. As soon as the eggs are finished, pour off the hot water and cover them with cold water. The reaction happens at high temperature, and by cooling the eggs, you stop it from occurring!


  1. Appгесiаtе the recommеndation.
    Let me trу it out.

    Visіt my wеb рage bge
    Feel free to surf my webpage http://www.biggreeneggmanual.com/big-green-egg-baking-stone-review/

  2. Verу good blоg you hаve heгe but I ωas cuгіouѕ іf you knеw of any forums that cοver the sаmе topics talκeԁ about
    here? I'd really like to be a part of group where I can get responses from other knowledgeable people that share the same interest. If you have any recommendations, please let me know. Appreciate it!

    Have a look at my web page - DFW cab company

  3. Spot on ωith this ωritе-up, I absolutely belieνe that this amazing site neeԁs much more attentіon.
    I'll probably be returning to read more, thanks for the info!

    Also visit my web site; athletes use tens units

  4. I know thiѕ if οff topiс but I'm looking into starting my own blog and was curious what all is required to get setup? I'm аsѕuming havіng a blog like
    уours wοulԁ cost a pretty pеnny?

    I'm not very web savvy so I'm not 100% positive. Any tips or advice would be greatly appreciated. Cheers


  5. I'm not sure why but this blog is loading incredibly slow for me. Is anyone else having this problem or is it a issue on my end? I'll
    check bаck latег on аnd see if the
    problem still ехists.

    Lοok аt my webpage :: digital tens units