It's called waterglassing and I found this info for you....
The incredible, edible egg can be stored in the basement or fridge. The eggs need to be turned once a week. Just keep them in a carton and turn them over once a week. Mother Earth News did a test years ago and I believe they kept eggs for 6 months in a cellar just that way. To check and make sure the eggs are good put in water. Good eggs lie on the bottom, they do not float. I store eggs with Sodium Silicate. It's the same stuff you get at the auto parts store or pharmacy. I found mine by the quart jar (much cheaper this way) for about $6 at the local pharmacy. We bought it to seal the engine of an old truck....and by the way...it worked great. The couple that we gave the truck too are still driving it a year after we did that seal thing with the sodium silicate. They've had no problems! P.S. I have a friend that got the WalMart pharmacy to special order her some...also they special ordered her citric acid for cheese making and it was much cheaper than anywhere we could find it!
STORE EGGS WITH WATERGLASS - #1
Waterglass (liquid sodium silicate) has several uses, one of them is for storing fresh eggs for extended periods of time. Here is a quote from Lehman's ad: "Preserve eggs for months with Waterglass. Mix one part Waterglass with ten parts cooled, boiled water and pour into a large, stone crock. Wipe off fresh eggs with a flannel cloth and place in solution (eggs should be covered with 2"). Cover crock and store in a cool, dry place. (From "The Boston Cooking School Cook Book" by Fannie Farmer, c. 1886) Waterglass (liquid sodium silicate) - One gallon bucket will preserve 50 dozen eggs. Non hazardous; fumeless. $21.95"
STORE EGGS WITH WATERGLASS - #2
We are the stewards of a flock of approximately 50 muscovy ducks. 35 are just chicks but we know we have 4 drakes and 11 hens of the mature ducks. They lay between 100 and 120 eggs a year per hen, if we end up with 20 hens that we keep that means about 2,000 delicious eggs.
Naturally I am concerned about storing eggs. So here is some of my egg research. Lehman sells waterglass, enough to preserve 40 dozen, that means by my recipe they are selling about a 1/2 pint for approximately $21. I bought 1pt 14 oz (almost 2 pints) for $8.19 at the pharmacy. I simply asked for Sodium Silicate Solution. They can order it if they don't have it. This brand is made by HUMCO out of Texarkana TX and will expire on Feb of 2003.
1 gallon of the solution (1 pint of sodium silicate solution to 9 or 10 pints of water yielding a little more than a gallon) should preserve 75 to 100 dozen eggs (900 - 1200 eggs) according to Carla Emery's an Encyclopedia of Country Living Old Fashioned Recipe Book (Page 346).
Here are the details of the method referred to as the Water-glass method. Pack them between 24 hours and 4 day old eggs. Older eggs don't keep as well. Eggs with no roosters or drakes around will keep longer than fertile eggs, but of course you then have to cope with unhappy roosters or drakes. 20 years ago when she wrote the book it was about $1.05 a pint now its $4.10 a pint still a bargain. Again, check the pharmacy first and I was told that many car parts dealers also have it. It is a 1:9 ratio if you want smaller quantities just keep the ratio intact. 1 cup to 9 cups or in my case 1 pint to 9 pints of water.
Have your crock scaled clean to start with she used deep plastic cans. I used plastic for the few eggs I had. Boil the water and let it cool before you add the waterglass. Then pour the mixed solution into the crock. Remember not to fill the crock or container too full of the solution because you will be adding eggs so no more than a third full.
Add the eggs. Make certain there is an extra 2 inches covering them. In hot weather it evaporates pretty fast so watch it carefully. Earthenware, enamel, glass or plastic all work fine.
Cover the container as tightly as you can. Don't let it freeze but store it in a cool dark place. It starts out clear liquid but gradually turns cloudy into a milk color sort of jelly. The book says it isn't harmful but the container had all these "be carefuls" on the labels so I asked the pharmacist and he said in a 1:9 ration it has no harmful effects.
It won't hurt you if you get it on your hands after it is mixed but I wore gloves to mix it. Make up enough solution as you go to handle any new eggs you put in. So if you are putting ten eggs make enough to cover them leaving 2 inches over the eggs. If it gets low due to evaporation add some more solution that is mixed 1:9.
To use the egg you will have to wash them so the goop doesn't fall into the food or if you hard boil them you should prick the small end so they don't pop. The sodium silicate works by sealing the eggs and should keep them for up to a year.
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