Preserving eggs in water, commonly called “water glassing,” involves submerging fresh, unwashed eggs in a lime-water solution that seals the shell’s pores and keeps eggs usable for many months. The method has been used for over a century, particularly by homesteaders looking to store surplus eggs without refrigeration. It’s straightforward to set up, but there are real safety considerations worth understanding before you start.
How Water Glassing Works
Every freshly laid egg has a natural protective coating called the “bloom” or cuticle. This thin layer covers the thousands of tiny pores in the eggshell, blocking bacteria from getting in and slowing moisture loss. When you submerge an egg in a lime-water solution, the alkaline liquid reinforces that natural seal, essentially locking the egg in a preserved state. The high pH of the solution also discourages bacterial growth in the surrounding water.
This is why unwashed eggs are absolutely essential. Commercial eggs sold in U.S. grocery stores have been washed and sanitized, which strips the bloom entirely. Once that coating is gone, the shell becomes porous and vulnerable. Washed eggs should be refrigerated and used within a couple of weeks. Only fresh, unwashed eggs with the bloom intact are candidates for water glassing. If your eggs have a bit of dirt or debris, you can gently wipe them with a dry cloth, but do not rinse them with water.
The Lime-Water Ratio
The standard recipe calls for one ounce of food-grade hydrated lime (calcium hydroxide) per one quart of cool water. If you need a larger batch, simply scale up: two ounces of lime to half a gallon of water, and so on. The key term here is “food-grade.” Hydrated lime sold for pickling and food preparation is what you want. It’s available at many grocery stores, homesteading supply shops, and online. Do not use agricultural lime, garden lime, or quicklime, which are chemically different products.
You’ll sometimes see the term “water glass” used to describe sodium silicate, a different preserving agent that was popular in the early 1900s. The calcium hydroxide (hydrated lime) method is what most people practice today. The two are not interchangeable, so make sure you’re buying the right product.
Step-by-Step Setup
You’ll need a food-safe container large enough to hold your eggs fully submerged. A half-gallon or gallon glass jar works well for smaller batches. A food-grade plastic bucket with a lid suits larger quantities. Avoid metal containers, as the alkaline solution can react with certain metals over time.
- Mix the solution. Add one ounce of food-grade hydrated lime per quart of cool, filtered water. Stir thoroughly. The mixture will look milky. Some sediment settling to the bottom is normal.
- Add eggs gently. Place unwashed, clean, intact eggs into the container pointy-end down. Lower them in carefully so the shells don’t crack. A cracked egg should never go into the solution.
- Keep eggs submerged. Every egg must stay completely below the surface of the liquid. As you add eggs over time, top off with more solution (at the same ratio) to keep them covered.
- Seal and store. Cover the container with a tight-fitting lid. Store it in a cool, dark location like a basement, root cellar, or pantry. Consistent, cool temperatures help maintain quality. Avoid anywhere that gets warm or receives direct sunlight.
You can continue adding fresh unwashed eggs to the container over days or weeks as your hens lay. Just make sure each new egg is fully covered by the solution.
How Long Water Glassed Eggs Last
Homesteaders commonly report keeping water glassed eggs for 12 to 18 months, and some claim even longer. However, quality does degrade over time. Eggs stored for extended periods can develop changes in texture, nutrient content, and flavor. The whites may become thinner, the yolks can lose some of their bright color, and some people notice a mildly alkaline or bitter taste, particularly in eggs that have been stored for many months. Oxidative changes inside the egg continue slowly even in the solution.
Fresher eggs in the jar will taste better than ones that have been sitting for over a year. Many people rotate their supply, using the oldest eggs first and adding new ones as they become available.
Using Preserved Eggs
When you’re ready to use an egg, remove it from the solution and rinse it thoroughly under running water. The lime residue on the shell is alkaline and you don’t want it transferring to your food. Once rinsed, use the egg as you normally would for scrambling, baking, or frying.
One practical note: the lime solution seals the shell pores so completely that air can’t escape during cooking. If you try to hard-boil a water glassed egg without preparation, the shell is more likely to crack from pressure buildup. Pricking a small hole in the wider end of the egg with a thumbtack or needle before boiling helps steam escape and prevents cracking. This is a quirk specific to preserved eggs, not something you’d normally need to do with fresh ones.
Water glassed eggs work well for most cooking purposes, especially baking, where subtle flavor or texture changes are masked by other ingredients. For dishes where egg quality is front and center, like poached eggs or soft-boiled eggs, fresher preserved eggs (under six months) tend to perform better.
Safety Concerns Worth Knowing
Water glassing is widely practiced in homesteading communities, but it’s worth noting that food safety authorities have not endorsed the method. Utah State University Extension has stated plainly that water glassing “is not considered safe, nor is it a recommended method to store eggs for the long term.” Their concerns include nutrient degradation, oxidative changes, altered protein quality, and the potential for off-flavors.
The core issue is that water glassing hasn’t been rigorously tested under controlled conditions the way canning or freezing methods have. There’s no standardized process validated by the USDA or cooperative extension system. USDA research on egg storage has consistently found that refrigeration at 45°F or below is the most effective way to maintain egg quality and safety over time. Eggs stored at cool temperatures in a refrigerator remain high quality for weeks, while quality degrades rapidly without refrigeration.
This doesn’t necessarily mean every jar of water glassed eggs is dangerous. Millions of people have used the method without reported illness. But the lack of formal testing means there are no established guidelines for how long is truly safe, what temperature thresholds matter most, or how to identify eggs that have gone bad beyond the obvious float test and smell check. If you choose to water glass, understanding that you’re working outside the bounds of tested food preservation science is important context.
Selecting the Best Eggs
Not every egg is a good candidate. Beyond the unwashed requirement, you want eggs that are as fresh as possible, ideally collected the same day they were laid. Eggs with any visible cracks, thin spots, or shell irregularities should be set aside for immediate use rather than preservation. The integrity of the shell is your first line of defense.
Fertilized and unfertilized eggs both work. Breed doesn’t matter. If you’re buying eggs from a local farmer specifically for water glassing, confirm they haven’t been washed. Many small-scale producers sell unwashed eggs, but it’s always worth asking. Eggs from farmers’ markets or roadside stands are more likely to have the bloom intact than anything from a grocery store, since producers with fewer than 3,000 hens are often exempt from federal washing regulations.