Naked Science Forum
General Science => General Science => Topic started by: chris on 23/08/2003 14:46:57
-
I have finally found that answer to the nature of the grey film around the yolk of a boiled egg...
"[high temperature when cooking an egg] causes a chemical reaction between the yolk and the white that leaves a green film around the yolk. That film is iron sulfide, caused by iron in the yolk reacting with hydrogen sulfide in the white"
So who wants to do the experiment in which a egg is hard boiled using a high temperature versus a cooler temperature ?
Chris
"I never forget a face, but in your case I'll make an exception"
- Groucho Marx
-
So that would explain why immersing the eggs in cold water afterwards sometimes avoids the grey film -- it lowers the temperature. Bravo, Chris.
Bezoar
-
Longer with higher temperature = Greyer. Glad that was finally sorted out. Thanks, Chris.
Am I dead? Am I alive? I'm both!
(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fwww.stupid-boy.com%2Fsmilies%2Fkao%2Fotn%2Fcat.gif&hash=e4b91a72c020cc1c5d28487fff5428f1)
-
So did you actually try it Quantum ? And it worked ? Nice one !
Chris
"I never forget a face, but in your case I'll make an exception"
- Groucho Marx
-
I'll bet some chef somewhere has the formula for perfect hard boiled eggs. Maybe we should have checked the cookbooks.
Bezoar
-
Try one of Delia Smith's cookbooks.
So...cooling rapidly with cold water cause the reactant to lose energy and therefore unable to perform the reaction.
Angel (https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fsmilies.networkessence.net%2Fs%2Fcontrib%2Fruinkai%2FbiggrinangelA.gif&hash=7a3ab31861328a98db23edcb21639ab9)
-
See? I knew it.
Bezoar
-
Bezoar
Indeed, Julia Child has a recipe for "The perfect Hard Boiled Egg" It works every time! Start the eggs in cold water, when the water just starts to boil turn off the heat and let sit for 17 minutes. The immerse in ice water. The perfect egg has no grey line!!
-
Julia to the rescue. I learned to cook on one of her cookbooks. Obviously, not the one with the hard boiled egg recipe.
Bezoar
-
Bezoar, I bet you're a great cook too. I'm pathetic in that department, though I make excellent roast beef and yorkshire pudding and, lucky for me, Bruce makes delicious meals. Maybe we could have a "Science of Cooking" section[:p].
-
Love to gourmet cook, and spend the day in the kitchen cooking a fabulous meal. However, in my older years my waistline doesn't like it, so I've gone to healthier cooking. But you know, living in New Orleans really spoils you for getting used to good food. Makes it hard to travel cause you can't find a restaurant that even halfway compares to what we have here.
-
I thought they had McDonalds and Burger Kings all over the world, not just in New Orleans [;)]
Chris
"I never forget a face, but in your case I'll make an exception"
- Groucho Marx
-
I do recall going to a Mc Donald's in London. It was one of the best meals I had there. You guys definitely do not know what good food is. The second best meal was right around Windsor castle, and it was Shepherd's pie! Oh no, y'all need to come visit here for good food.
-
Bezoar, I second your opinion of the food in London. Had the most horrible (and expensive) quiche there, among other hideous dishes, and no one knew what ketchup was!
-
The food must have been bad if you wanted to add ketchup to it !
"I never forget a face, but in your case I'll make an exception"
- Groucho Marx
-
I dated a girl from England once. I had dinner with her family and it was quite interesting. I learned that alot of the quisine there is boiled. Of course everything here seams to be fried or grilled, so it wasn't too appealing. However, there was this dessert that was awesome. It was alot like flan.
-
That's probably the cheescake then ?
"I never forget a face, but in your case I'll make an exception"
- Groucho Marx
-
Nah, it was like a stiff vanilla pudding. Mmmmmm, it was good. I think it had cinnamon on it as well. It was alot like flan, but a little fluffier.
-
Yep, sounds like cheesecake. It's called cheesecake but actually isn't made of your average cheddar ! It uses cream cheese on a biscuit base and you flavour it with lemon or, as you say, vanilla and add chocolate sprinkles, cream and fruit to the top. Delicious.
Chris
"I never forget a face, but in your case I'll make an exception"
- Groucho Marx
-
I haven't traveled to England or New Orleans (Closer to there though, being from Arkansas) so I can't comment much on the food in either place.
But back to the boiled eggs. How do you change the temperature while boiling the egg? I always thought that water boils at a fixed temperature, based on the pressure (elevation), and as long as there is liquid water it will never be any hotter.
I know if you leave the eggs boiling for about twenty minutes they end up very hard to break, which is great for easter eggs. Otherwise I'm no expert since I can't stand a soft boiled egg. And since eggs in general aren't too good for heart health, I just don't eat boiled eggs.
Otherwise, I love food of almost any description, the more spice the better.
------------------------
No words of wisdom here.
-
Tweener,
If you love the spice, you should do yourself a favor and jaunt down to New Orleans for a few meals. There's nothing better than "Dat dere gator tail etouffe' wit' some jambalaya". I eat Mexican quite often and cajun every chance I get.
However, if eggs are not safe for you, cajun would be very dangerous. Crawfish hollandaise sauce is all butter and egg. Roux is a clogged artery on a plate. [:)]
-
Ronnie,
I love eggs and don't have any adverse reaction, but I'm just trying to keep my heart in shape.
As for the "Dat dere gator tail etouffe' wit' some jambalaya", I'd love it! I just never get that far south.
Kansas City Barbeque keeps my arteies well clogged for now.
John
------------------------
No words of wisdom here.
-
Bezoar, I second your opinion of the food in London. Had the most horrible (and expensive) quiche there, among other hideous dishes, and no one knew what ketchup was!
What? Do they not have soya bean? Though it does make me curious, since I don't like ketchup.
-
Yep, sounds like cheesecake. It's called cheesecake but actually isn't made of your average cheddar ! It uses cream cheese on a biscuit base and you flavour it with lemon or, as you say, vanilla and add chocolate sprinkles, cream and fruit to the top. Delicious.
Actually sounded more like a custard pie to me. Which is basically cheesecake without the cheese. But they're all just a variation on egg + dairy + sugar + other thickeners in variable proportions.