Why silver tarnishes — and when to leave it alone
Silver tarnish is not dirt. It is the result of a chemical reaction between silver and sulphur compounds in the air — hydrogen sulphide and carbonyl sulphide being the main culprits. The sulphide layer that forms on silver gives it the dark, antiqued appearance that is characteristic of older pieces, and it is entirely natural.
For everyday silverware — a set of cutlery, a set of sugar tongs, a cigarette case you use — removing tarnish is reasonable and the methods below are safe. But there is a category of silver where tarnish and patina should be left alone: antique and collectable pieces. Antique silver that retains its original patina — the warm, uneven, natural oxidation that accumulates over decades — is more authentic, more honest, and in many cases more valuable to a specialist buyer or collector than the same piece stripped back to a bright factory finish.
If you have inherited silver, or found pieces in a house clearance, do not clean them before getting an assessment. Over-cleaning is one of the most common mistakes sellers make — and it permanently reduces value. Send silver to Fair Vintage as found. Our specialists assess patina correctly and value aged pieces at collector prices, not just the metal weight.
The rule of thumb: if a piece is primarily functional — something you use weekly and clean regularly — safe cleaning is fine. If a piece has hallmarks, a maker's mark, an unusual form, or appears to be old and interesting, get it assessed first.
The three methods that work
This electrochemical method is the most effective for heavily tarnished sterling silver and works without any physical abrasion at all. The tarnish (silver sulphide) is converted back to silver by transferring the sulphide to the aluminium foil, which is why the foil turns dark and the silver brightens.
- Line a glass or ceramic bowl (not metal) with aluminium foil, shiny side up.
- Place the silver items on the foil, ensuring they touch the foil.
- Add one tablespoon of bicarbonate of soda and one tablespoon of salt for every litre of water you will use.
- Pour boiling water over the pieces until they are submerged.
- Leave for 5–10 minutes — you will see the foil darken as the tarnish transfers.
- Remove with tongs (the water is hot), rinse thoroughly with clean water, and dry immediately with a soft cloth.
Do not use this method on: silver with gemstones or pearls (heat and water can loosen settings or damage the stones), pieces with applied enamel, pieces where the dark patina in recessed areas is intentional and decorative (the electrolytic process is not selective and will remove recessed patina too), or antique pieces with maker's marks you wish to preserve.
A good quality silver polishing cloth — the type impregnated with a gentle polishing compound — is the most practical everyday tool for silver that tarnishes lightly. The cloth is non-abrasive enough for regular use and gives an excellent surface polish without any liquids or risk of water damage.
Use a gentle circular motion, then buff with the clean side of the cloth. Do not rub in straight lines along engraving or chasing — work with the design rather than across it. The cloth turns dark as it absorbs tarnish; replace it when the clean area no longer appears to polish effectively.
For fine silver jewellery — rings, earrings, pendants — a polishing cloth gives you better control than any liquid method. You can polish individual areas and leave recessed details dark if you choose to.
Specialist silver cleaning pastes — brands such as Goddard's Silver Polish, Silvo, or Town Talk — contain very fine abrasive particles designed specifically for silver. They remove tarnish more aggressively than a polishing cloth but with enough control that you can work around details.
Apply a small amount with a soft cloth or cotton wool. Work in small sections, remove with a clean damp cloth, then dry and buff. For intricate pieces with chasing, repoussé work, or engraving, use a soft toothbrush to work the paste into recesses — but this will also remove the dark patina in those areas, so consider whether that is the result you want.
Silver paste is the most precise method for hollowware with detailed surfaces — teapots, cream jugs, sugar bowls, candelabra — where the bicarb dip cannot be targeted effectively.
What not to use on silver
| Avoid | Why |
|---|---|
| Toothpaste | Too abrasive. Micro-abrasives formulated for tooth enamel will scratch soft silver surfaces, dulling the polish and potentially damaging hallmarks and engraving. One of the most widely recommended and most damaging home remedies. |
| Lemon juice and salt | The acid in lemon juice can etch silver and remove surface detail. Salt increases the abrasive effect. This combination is particularly damaging to silver plate, where it can strip the plating layer entirely. |
| Baking soda as a paste (dry) | Bicarbonate of soda dissolved in water is safe (method 01). Applied dry to a damp cloth as a paste, it is abrasive and will scratch. The distinction matters: the dissolved version works by electrolysis; the dry version works by scratching. |
| Household bleach or white vinegar | Both are too chemically aggressive for silver. Bleach can cause stress corrosion cracking in silver alloys. Vinegar is acidic and can etch the surface. Neither is recommended for any silver cleaning. |
| Abrasive cloths or steel wool | Anything more abrasive than a soft cotton cloth or specialist polishing cloth will scratch silver permanently. Even the rough side of a kitchen sponge is too abrasive for a silver surface. |
| Ultrasonic cleaners | Ultrasonic cleaning is fine for many metals but can damage silver with certain types of enamel, set gemstones, or glued decorative elements. Use only if you are certain the piece has no applied or set elements. |
When not to clean silver at all
The single most important thing to understand about antique silver is that patina is value, not dirt. The natural oxidation that accumulates over decades — particularly in the recesses of chased, engraved, or repousséd decoration — gives a piece its character and authenticates its age. A Georgian silver teapot with its original patina intact is worth considerably more to a specialist buyer or at specialist auction than the same teapot that has been over-polished to a bright modern-looking finish.
Items you should not clean before assessment or sale:
- Any piece you believe to be genuinely old — Victorian, Georgian, Edwardian, or earlier.
- Pieces with hallmarks suggesting a named maker or a specific period.
- Pieces with engraving, armorial bearings, or presentation inscriptions.
- Silver that forms part of an inherited collection or estate — even if it looks ordinary, send it as found.
- Any piece where the dark areas in the decoration appear intentional and designed (this is called oxidation or niello, and it is a deliberate feature).
We ask all sellers to send silver as found. Pieces that arrive in original uncleaned condition are easier to assess correctly and always receive a more accurate valuation. A piece that has been over-polished has lost information that cannot be recovered — and we cannot offer a collector premium on a piece whose original surface has been altered.
How to store silver to slow tarnishing
If you are keeping silver in long-term storage, the goal is to limit its exposure to sulphur compounds in the air. Practical steps:
- Wrap in acid-free tissue or flannel. Both protect against contact tarnish without trapping humidity.
- Use felt-lined cases or wooden boxes. The traditional method still works well; the felt slows sulphur exposure and cushions the pieces.
- Avoid plastic bags. Sealed plastic can trap humidity and, in some plastics, sulphur compounds. Zip-seal bags are generally not recommended for long-term silver storage.
- Use anti-tarnish strips. Small strips of activated carbon or Pacific Cloth placed in the storage container absorb sulphur from the surrounding air.
- Keep away from rubber. Rubber contains sulphur and will cause accelerated localised tarnish wherever it contacts silver.
- Control humidity. A small silica gel sachet in the storage box absorbs moisture and slows the tarnishing reaction.
Silver that is used regularly — cutlery washed after meals, jewellery worn often — often stays cleaner than silver stored for long periods. The handling and washing cycle removes surface sulphides before they have time to build up to heavy tarnish.
Not sure what your silver is worth?
Send a photograph of your silver pieces for a free specialist assessment. Our team will identify the hallmarks, confirm the maker if present, and give you a market valuation before you post anything — and we always want pieces as found, not polished.
Get a free estimate →Frequently asked questions
The aluminium foil and bicarbonate of soda method is the gentlest and most effective for heavily tarnished sterling silver. Line a bowl with aluminium foil, add bicarbonate of soda and salt, pour over boiling water, and let the electrochemical reaction do the work without any scrubbing. For lightly tarnished pieces, a silver polishing cloth is quicker. For intricate pieces, a specialist silver paste applied with a soft cloth gives the most control. All three methods are safe for sterling silver used regularly.
The aluminium foil and bicarbonate of soda dip is safe for sterling silver flatware, plain hollowware, and simple jewellery. It is not suitable for silver with gemstones, pieces with applied glued decorations, or pieces with intentional dark patination in the recesses. Do not use bicarbonate of soda as a dry paste — applied this way it acts as an abrasive and can scratch soft silver surfaces. The dissolved version (in the dip method) is safe; the dry paste is not.
No. Despite being widely recommended, toothpaste is too abrasive for silver. The micro-abrasives formulated for tooth enamel will scratch silver surfaces, dulling the finish and potentially damaging engraving or hallmarks. Use a dedicated silver polishing cloth or specialist silver paste instead.
No. This is one of the most important things to understand before selling silver. Antique and collectable silver retains a natural patina that authenticates age and appeals to collectors. Cleaning it — especially aggressively — permanently damages this patina and can reduce the value significantly. Send silver to Fair Vintage as found. Our specialists assess pieces correctly in the condition they arrive and will never penalise you for tarnish.
Store silver wrapped in acid-free tissue or in felt-lined cases, away from rubber and plastic. Anti-tarnish strips placed in the storage box absorb sulphur from the air. Silica gel sachets control humidity. Keep silver away from foods with high sulphur content (eggs, onions, mustard). Silver that is used and washed regularly often tarnishes more slowly than silver in long-term storage.