A stainless pan picks up marks. None of them is a manufacturing fault, and only one is a real problem. Here's how to tell them apart, in the order you'll meet them.
1. The chalky white haze
What it is: limescale. It comes from the water, not the cooking. It shows up mostly when you let the pan air-dry after washing, or when you boil water in it.
The fix, two minutes: plain white vinegar in the cold pan, enough to cover the base, five minutes, wipe lightly, rinse, dry with a cloth. Diluted citric acid or half a lemon do the same.
So it doesn't come back: dry with a cloth rather than in the air. Water left to dry by itself is what deposits the limescale. The everyday routine, in two minutes: washing a stainless pan every day.
2. The blue, purple and gold tint
What it is: an extremely thin oxide layer formed by heat — the same phenomenon as the colours on steel heated by a blacksmith. It appears when the pan has been hot, often empty.
Is it serious? No. It's harmless, it changes nothing about cooking, it doesn't get worse, and plenty of cooks never remove it — some read it as proof a pan actually gets used.
If it bothers you: white vinegar, same method as for limescale. It'll come back the next time you cook hot.
3. Small white pits
What it is: marks left by salt. Salt cold or barely warm water and the crystals sit on the base, in contact with the metal, waiting to dissolve.
How to avoid it: salt once the water boils, not before. It's also faster — salted water takes slightly longer to boil.
If the marks are already there: they stay visible but have no effect on cooking or on the strength of the pan.
4. The sticky brown that keeps coming back in the same spot
What it is: polymerised oil. A film of fat heated past its smoke point has turned into a hard, tacky layer. You see it most on the outer walls and around the edge of the base, where oil pools without cooking.
This is the one that genuinely sticks, because it makes the surface uneven. It's also what happens when you try to season a stainless pan — why it doesn't hold.
The fix: two centimetres of water, two tablespoons of baking soda, ten minutes at a simmer, then scrape. If it resists, a baking soda paste left on for fifteen minutes, then a scouring pad following the grain of the metal. Full detail: bring a burnt pan back in 10 minutes.
5. Orange rust spots
This is the only mark that calls for action. 304 stainless doesn't rust: what you're seeing is almost always iron particles deposited by something else, rusting on the surface.
The two usual causes: ordinary steel wool used for scrubbing, which leaves fibres behind; or prolonged contact with an iron object in the sink or dishwasher.
The fix: scrub with baking soda or a stainless cleaner, rinse thoroughly, dry. And stop using ordinary steel wool: a scouring pad or a purpose-made stainless scourer does the same job and leaves nothing behind.
Never: bleach. Chlorine pits stainless steel and leaves marks that really are permanent.
The quick table
| What you see | What it is | What to do |
|---|---|---|
| Chalky white haze | Limescale | White vinegar, 5 min |
| Blue or gold tint | Heat oxide | Nothing, or vinegar |
| Small white pits | Salt | Nothing — salt boiling water |
| Sticky brown | Polymerised oil | Simmered baking soda |
| Orange spots | Deposited iron | Baking soda + change your sponge |
Why all of this cleans off
That's the underlying difference with a non-stick. On a coating, a mark is often permanent, because the layer itself is damaged and you can't scrub hard, simmer baking soda, or use a scouring pad.
On uncoated stainless there's nothing to protect. A pan that looks tired is almost always a dirty pan, not a worn one.
Ours is here, 304 stainless with no coating: there's nothing to chip. 2-year guarantee.
