Chocolate · 2.5
Storing chocolate, and what bloom is
Two faults with one appearance, and the finger tells you which one you have. Both are harmless and both change the texture.
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A bar that has gone pale and streaky has not spoiled. It has one of two faults with one appearance, and telling them apart takes a finger.
Fat bloom
Cocoa butter has migrated to the surface and recrystallised in an unstable form. It happens when the bar has been warm, or has cycled between warm and cool, and it is the commoner of the two.
It looks like a grey film or streaks following the shape of the mould. Touched, it is smooth and slightly greasy, and it melts under a fingertip because it is fat.
Sugar bloom
Moisture condensed on the surface, dissolved some of the sugar, and evaporated, leaving the sugar recrystallised as a fine crust. It happens when a cold bar meets warm damp air, which is exactly what happens when you take chocolate out of a fridge and unwrap it.
It looks similar and feels completely different: gritty, dry, and it does not melt under a finger because it is not fat.
Why it matters and why it does not
Neither is a safety question and neither means the chocolate has gone off. Both change the texture: fat bloom makes the snap dull and the melt uneven, and sugar bloom makes the surface sandy.
Both are also permanent for practical purposes. Melting and retempering fixes fat bloom and is not something anybody does at home to a bar they were going to eat.
Where to keep it
Between about fifteen and eighteen degrees, dry, dark, sealed, and away from anything that smells. A cupboard on an inside wall, not above the cooker and not in a sunny room.
Cocoa butter absorbs odours readily, which is not a figure of speech: chocolate stored unwrapped next to coffee or spices will taste of them within days. This is the most underrated line in this entry.
The fridge, and how to use it if you must
A fridge is too cold for serving and humid enough to cause sugar bloom the moment the bar comes out. In a hot climate or a hot week it is still sometimes the only option.
If it has to happen: seal the bar airtight, and when you take it out leave it sealed until it has come up to room temperature. The condensation then forms on the wrapper rather than on the chocolate, which is the entire trick.
Unwrapping a cold bar in a warm kitchen is the reliable way to produce sugar bloom, and it is what most people do.
How long each kind keeps
Dark keeps longest, because it has no milk solids to go rancid. Kept properly it is good for a year or more and changes slowly rather than failing.
Milk and white have dairy fat in them and a shorter life, typically around half as long, and they fail by tasting stale rather than by tasting of anything alarming.
None of them is dangerous when old. They become dull, and dullness is the actual argument for eating them.
Carrying it home from a February festival
The specific hazard of this event: a cold car, then a warm house. That is the sugar bloom pathway exactly, and it happens overnight to bars left in a bag by the door.
Bring the bag inside, leave it closed for an hour or two, and unpack when everything has settled. It costs nothing and it is the difference between the bar you bought and a bar with a crust on it.
Whether chocolate improves
A little, and less than the enthusiasts claim. Some sharpness settles in the first weeks after a bar is made, and some makers rest their chocolate deliberately for that reason.
After that it is downhill slowly. There is no equivalent of a wine cellar here, and a bar kept for a special occasion is usually worse than the one eaten in March.
The smell test
Before anything else, smell a bar you have doubts about. Dairy fats go rancid before they taste obviously wrong, and the nose picks it up first: a faint crayon or old-nut note where there should be cocoa.
Dark chocolate rarely produces it. Milk and white produce it eventually and it is the actual end of their useful life, well before any date printed on the wrapper.
What to wrap it in
Foil then paper is the traditional arrangement and it is a good one: the foil handles moisture and light and the paper handles handling. A resealed bar in its own wrapper inside a sealed box is as good as anything.
Plastic film alone is the worst common option, because it is permeable to odour and traps whatever moisture is already there.
Buying more than you can eat
The practical failure at a festival is enthusiasm: eight bars bought on a Saturday, two eaten in the first week, six still in a drawer in May.
Dark survives that and milk does not. If the plan involves keeping some of it, the dark bars are the ones to buy in quantity and the milk and white are the ones to buy for this week.
The short version
Fifteen to eighteen degrees, dry, sealed, dark, away from anything that smells. Bloom is harmless and tells you which of those five was broken.
Also in this part
- 1.1
Why a dry red and a sweet chocolate fight
The wine must be at least as sweet as the food. Everything else in this entry is a qualification of that sentence.
Read it → - 1.2
Tannin and fat: what happens in the mouth
Astringency is not a flavour. You are noticing the absence of lubrication that was there a moment ago.
Read it →
For further context, see FoodKeeper storage reference.