Vivid Ready

Fresh unwashed eggs kept a year or more in a lime solution, no refrigeration and no fuel. It only works on eggs that still have their bloom, which rules out every egg in a supermarket.

Water glassing keeps fresh eggs edible for a year or more at room temperature, with no fuel, no processing and no electricity. In a household with hens, it turns the spring and summer glut into winter protein, which is exactly the seasonal problem a British smallholding has.

It is genuinely excellent and it has one hard prerequisite that rules most people out.

Correcting a figure

Why it works

An eggshell is porous. Air, moisture and bacteria pass through it, which is why an egg left out slowly dries, loses weight and eventually goes off.

A hen coats each egg as she lays it with a thin protective layer called the bloom or cuticle, which plugs those pores. That is why unwashed eggs keep for weeks on a worktop, and why British shops sell eggs unrefrigerated while American shops refrigerate theirs: UK eggs are not washed, US eggs are, and washing removes the bloom.

Water glassing adds a second seal. Calcium hydroxide solution is strongly alkaline, and it reacts at the shell surface to deposit calcium carbonate into the pores, sealing them. The alkalinity also makes the solution itself hostile to bacteria.

The egg sits in a sealed, sterile, alkaline environment and simply waits.

The eggs this needs

DANGER

Only fresh, clean, unwashed eggs with the bloom intact.

Never use shop-bought eggs. Even in the UK, where eggs are not routinely washed, they have been graded, handled and stored for an unknown time. American eggs are washed and are completely unsuitable.
Never wash the eggs. Not with water, not with a cloth, not "just the dirty one". Washing destroys the bloom, and an egg with no bloom will spoil in the jar and can spoil the whole batch.
Never use a cracked egg, or one with any hairline flaw. Hold each one up to a bright light and look.
Use eggs no more than a few days old, ideally same day. This preserves what you put in; it does not improve it.
Do not use eggs that have been refrigerated and then warmed, because condensation on the shell draws contamination in through the pores.

If an egg is dirty enough that you would not want it in the jar, eat that one now and put a clean one in instead. Dry-brush light soiling with a dry cloth or a piece of fine sandpaper if you must, never wet.

This is why the technique is for households with hens. If you have no hens, the honest answer is that water glassing is not available to you, and freezing beaten eggs is the practical alternative.

The solution

The ratio

28 to 30 g of pickling lime per 1 litre of water.

Or 1 ounce per US quart, which is the figure in most published recipes.

Water	Pickling lime
1 litre	30 g
2 litres	60 g
5 litres	150 g

Pickling lime is calcium hydroxide, also sold as hydrated lime or slaked lime.

Garden lime is calcium carbonate and will not work. It is far less alkaline and will not seal the shells. The names are similar and the products sit near each other in shops.

Use cool water. Distilled or boiled-and-cooled is preferred; hard tap water works but may cloud.

Doing it

Choose a container. A food-grade bucket with a lid, a large glazed crock, or wide-mouth glass jars. It must be non-reactive: no bare aluminium, no galvanised metal, no unglazed earthenware.
Mix the solution at 30 g per litre, stirring until dissolved. It will look milky and will not fully clear. That is normal.
Lower the eggs in gently, pointed end down. Pointed end down keeps the air cell at the top and the yolk centred, which is the same reason egg boxes are built that way.
Keep them fully submerged, with at least 5 cm of solution above the topmost egg. An egg that bobs above the surface is not preserved.
Cover. A lid, or a plate, to keep dust and insects out. It does not need to be airtight.
Store somewhere cool and dark. A cellar, a north-facing larder, a garage. Cooler is better; it does not need to be cold.
Leave them. Do not stir, do not decant, do not keep opening it.
You can keep adding eggs as they are laid, topping up the solution to keep everything covered.

Expect the lime to settle into a white layer on the bottom over time. That is normal and not a problem.

Using them

Take out what you need, from the top, with a clean utensil or a gloved hand.
Rinse thoroughly under running water. They will feel slightly slippery.
Use them like fresh eggs, with two caveats below.
Always crack each one into a separate bowl first, never straight into a mixing bowl of other ingredients. This is the standard practice with any stored egg and it costs nothing.

Test any egg you are unsure about: put it in a bowl of plain water. It should lie flat on the bottom. An egg that stands on end is old; one that floats is discarded, unopened, without smelling it.

The alternatives

Worth knowing, since water glassing rules out anyone without hens.

Method	Keeps	Notes
Water glassing	12 to 18 months, up to 2 years	Best for volume. Needs unwashed fresh eggs
Freezing, beaten	12 months	Works with any eggs including shop-bought. Beat, add a pinch of salt or sugar, freeze in portions. Needs power
Freeze drying	Years	Equipment cost is high
Dehydrating, scrambled first	6 to 12 months	Cook, dry, powder. Works, and the texture is poor
Larder, unwashed, cool	4 to 8 weeks	Free, requires nothing. The default for a British household
Mineral oil coating	6 to 9 months	Rub each egg with food-grade mineral oil to replace the bloom. Simpler than water glassing, shorter keeping
Pickling in vinegar	Months	Changes the food entirely, but it is genuinely good

The oil method is the underrated one: it is the same principle as water glassing, needs no caustic chemical, and is worth knowing if pickling lime is not to hand.