Put a bright orange dried apricot next to a dark brown one and almost everyone reaches for the orange. It looks fresher, cleaner and more appetising. It is also the more heavily processed of the two, and the colour is the processing.
What the treatment does
Fruit browns when it dries. Cut an apple and watch it — enzymes react with oxygen and the flesh darkens. Apricots do exactly the same over the days they spend drying, ending up somewhere between deep amber and dark brown.
Sulphur dioxide stops that reaction. Fruit is exposed to it before drying, the browning never happens, and the result keeps a colour close to fresh apricot indefinitely. It also acts as a preservative, extending shelf life and inhibiting mould.
It is permitted in most markets, including India, and must be declared on the label.
Why anyone would avoid it
Three reasons, of quite different weight.
Sensitivity. A minority of people react to sulphites, and the reaction is significantly more common among people with asthma. For them it is a genuine health consideration rather than a preference.
Taste. Sulphured apricots carry a faint sharpness — a slightly chemical top note that sits over the fruit. Unsulphured fruit tastes more concentrated and more like the apricot it came from, with a caramelised, almost date-like depth that the treated version does not develop.
Honesty of appearance. This is the smallest reason but not a trivial one. A uniform bright colour means you cannot judge the fruit by looking at it, because the thing you would be judging has been standardised away.
Why sulphured fruit still dominates
Because it sells. Given a choice on a shelf, buyers overwhelmingly pick the bright fruit, and retailers stock what moves. It also travels and stores better, which matters in a long supply chain.
None of that is sinister. It is simply worth knowing that the visual cue you are using selects for treatment rather than for quality.
What unsulphured khubani should look like
Dark. Somewhere between deep amber and genuine brown, and — importantly — not all the same shade. Natural drying produces variation, and a bag where every piece matches has been processed to make it match.
The fruit should be supple rather than hard. Himalayan khubani is typically dried whole, sometimes on the stone, and the stoned-after-drying fruit holds more perfume than fruit stoned first. Both are sold; the difference is worth asking about.
The smell should be concentrated and jammy. A faint sharp, struck-match note is sulphur and tells you what you are holding whatever the label says.
Using them
Unsulphured apricots are firmer and more concentrated, and they reward soaking. Half an hour in warm water or tea transforms them, and the soaking liquid is worth keeping for whatever they are going into.
They are excellent in slow-cooked savoury dishes for the same reason — they hold their shape where softer treated fruit collapses, and the deeper caramel notes stand up to spice.
Storing them
Cool, dark, sealed. Without sulphur as a preservative they have a shorter working life, which is the honest trade-off for the treatment not being there. Buy quantities you will get through in a few months rather than a year, and keep them away from warmth — they will continue to darken slowly, which is cosmetic rather than a problem.