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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Do not start by scrubbing. A coin recovered from soil may have ordinary dirt, stable tarnish, active corrosion, salt contamination, or a fragile surface layer that carries its date and design. Photograph it as found, keep every deposit in place, and have a conservator assess crusts, powdery green or red corrosion, flaking, pitting, concretions, or suspected salts. The only home cleaning described by the Canadian Conservation Institute (CCI) is a gentle wash for coins already judged suitable for routine handling.
Start with preservation, not cleaning
A dug coin is evidence as well as an object. Soil, encrustation and colour changes can record how the coin corroded, and deposits may be attached to a surface that is already weak. Removing them can erase details, expose fresh metal to moisture and make later conservation harder.
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Document the find before touching the surface
- Photograph both faces, the edge and any attached soil in even light. Include a scale and record the date, location and circumstances of recovery in your own records.
- Describe what you can see without interpreting it: loose soil, hard crust, green or red powder, black tarnish, pits, cracks, lifting flakes or a coating.
- Keep loose fragments and anything that falls away in a labelled container. Do not brush deposits off to make the coin more legible.
- If the find may be archaeological, check the reporting and ownership rules for your jurisdiction before altering it. CCI conservation notes do not determine local legal requirements.
Package it safely while you seek advice
Handle the coin by its edge only when the edge is sound. If touching the edge causes flakes or powder to move, stop handling it and support it from below with a clean, inert surface. Keep the coin separate from other finds so loose corrosion cannot abrade another object. Do not seal a visibly damp, salt-contaminated object in a way that forces you to guess at its drying history; ask a conservator what temporary enclosure and moisture control are appropriate for the specific find.
When to stop and seek a conservator
CCI’s official coin-care guidance states: “In general, removing corrosion from the surface of a coin should be left to a conservator.” Treat that as the default for a coin from the ground when the surface is uncertain. Arrange professional assessment if you see deep pitting, a friable or powdery layer, flaking, hollow-sounding crusts, active-looking green or reddish deposits, salt-like crystals, concretions, an old coating, or a coin too fragile to hold without movement.
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Do not let a salt-contaminated archaeological metal object dry while you are deciding what to do. CCI’s archaeological-collections guidance says metals covered in concretions or contaminated with salts should not be allowed to dry before conservation treatment. The correct immediate treatment depends on the object and its context, so ask a conservator rather than improvising a drying or soaking regime.
Separate dirt, tarnish and corrosion
“Dirty” is not a diagnosis. A brown film may be stable tarnish; a green area may be corrosion from copper in an alloy; a hard concretion may be soil cemented to the surface; and a powder that looks like ordinary dust may be an active corrosion product. Each responds differently to moisture and handling.
Stable colour change
CCI distinguishes stable corrosion or tarnish, which forms slowly as a colour change, from active corrosion that requires attention. A dark silver surface or a muted gold colour is not, by itself, proof that the coin needs treatment. Preserving a stable surface is often safer than trying to restore a bright, newly minted appearance.
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Active corrosion
Active corrosion can appear as powder, spreading spots, lifting layers or pits. It may continue when moisture, salts or pollutants are available. Do not scrape, pick or polish these areas at home. Corrosion removal is the point at which CCI recommends conservator work, not a stronger household cleaner.
Why colour cannot identify the metal
Gold and silver coins may be alloyed with copper. Copper can produce green or reddish corrosion, so a green mark does not prove that a coin is copper or that the deposit is harmless soil. Conversely, a coin that looks gold or silver may contain enough copper for corrosion to develop. Composition should be established by an appropriately qualified examination rather than by colour alone.
Condition-based handling decisions
Use the following triage table before choosing any treatment. It compares the surface condition, not brands or cleaning products.
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| What you observe | Safest next action | What to avoid |
|---|---|---|
| Loose soil on a sound-looking coin, with no powder, flaking or crust | Document it and ask whether a conservator considers it suitable for the limited wash described below. | Rubbing, brushing, polishing or trying to reveal the design with a tool. |
| Hard crusts, concretions, deep pits, lifting flakes or a friable surface | Keep the material in place and arrange a conservator’s assessment. | Soaking, scraping, picking, ultrasonic cleaning or any abrasive treatment. |
| Green or reddish powder, salt-like crystals, or other evidence of salt contamination | Prevent accidental drying and obtain context-specific conservation advice. | Leaving it to dry on a radiator, in direct sun or in a desiccating container; washing without a treatment plan. |
| Unknown coating, residue or previous treatment | Do not introduce solvents or cleaners until the coating and substrate have been assessed. | Acetone, acids, metal polish and commercial “coin dip” products. |
| Stable-looking tarnish on a coin that is robust enough for routine handling | Consider leaving the colour unchanged. If cleaning is genuinely needed, use only the limited CCI wash and stop if the surface changes. | Trying to return the coin to a bright, uniform finish. |
The limited wash for a suitable, stable coin
CCI Notes 9/4, published in the institute’s 2007 notes series, describes a restricted wash for coins suitable for routine handling and surface dirt or handling residues. It is not a general recipe for excavated coins. If you cannot confidently distinguish loose dirt from corrosion, use the conservator route instead.
Procedure
- Prepare a clean work area. Use a stable, padded surface so the coin cannot fall. Have lukewarm distilled water, a small amount of diluted mild soap, a second container of distilled water for rinsing and a clean paper towel ready.
- Wet gently. Allow the coin to contact the lukewarm distilled water and diluted mild soap. Do not scrub, brush, rotate it against a cloth or use a pointed implement.
- Watch the surface. Stop immediately if flakes move, a powder forms, a coating softens, the colour changes sharply or the coin reveals pits or an attached crust. Those signs move the object out of the routine-wash category.
- Rinse. Rinse with distilled water so soap is not left on the metal.
- Air-dry. Set the coin on a paper towel and let it air-dry without rubbing. Do not use heat, compressed air or a polishing cloth.
The CCI note also mentions soaking in acetone to degrease and dewater in its coin-care procedure. Acetone is a solvent, and a dug coin may have fragile corrosion, an old coating, organic residues or an unknown treatment. Therefore, do not add an acetone step to a newly found coin on your own; reserve solvent use for a conservator who has identified the materials and risks.
Why this wash has strict limits
The wash is intended to remove surface dirt or handling residues from a coin already considered stable. It is not intended to dissolve a concretion, brighten tarnish, extract salts or expose a hidden design. Distilled water limits introduced minerals, but it does not make an unknown archaeological surface safe. A coin can look solid while retaining a weak corrosion layer underneath, so the decision to wash must come before the water touches it.
Products and methods that can damage a find
CCI explicitly warns against coin dips and metal cleaners. Its statement covers cloths, wadding, liquids and pastes because the problem is not limited to one formulation.
| Method or product | Why it is risky | Safer decision |
|---|---|---|
| Coin dips | They may contain acids. If residues are not completely rinsed, the acid can degrade the coin. | Do not use one on a ground find; obtain conservation advice. |
| Metal-cleaning cloths, wadding, liquids or pastes | Many are abrasive and can scratch the surface, flattening details and leaving an artificial sheen. | Exclude them from routine care. |
| Scraping or picking with tools | It can remove original metal along with soil or corrosion and can detach fragile layers. | Leave crusts and deposits for examination. |
| Acidic household cleaners | Acid can attack the metal or an alloy component and may leave residues in pits. | Do not substitute a household acid for professional treatment. |
| Unplanned prolonged soaking | Water can mobilize salts or weaken a layered corrosion structure; the correct treatment depends on the object. | Use water only within the limited, pre-assessed CCI wash. |
The practical rule is simple: a product that makes a coin look brighter is not necessarily preserving it. Surface removal and corrosion treatment are different operations.
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How gold, silver and copper can behave differently
Gold-coloured coins
Gold is not automatically pure gold. CCI notes that gold may be alloyed with copper, and that copper can corrode green or reddish. A gold-coloured surface with a green deposit therefore needs the same caution as any other uncertain alloy. Do not assume that a yellow appearance makes an acid dip or polish safe.
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Silver-coloured coins
Silver can develop stable tarnish or colour change, and CCI notes that airborne pollutants may still tarnish silver even when most stable metal objects are stored under otherwise suitable conditions. A dark surface is not, by itself, a reason to strip the colour. If the coin has powder, pitting or a crust, treat it as a conservation problem rather than ordinary tarnish.
Copper and copper alloys
Copper can form green or reddish corrosion. Salt-contaminated copper alloys are particularly humidity-sensitive: CCI’s archaeological-collections guidance reports moderate corrosion risk above 42% relative humidity and very high risk above 68%, attributing those thresholds to Rimmer and colleagues (2013). These figures apply to salt-contaminated copper alloys, not to every copper coin or to gold and silver coins without demonstrated salt contamination.
Storage after handling or assessment
Storage should match the coin’s condition. A holder that is acceptable for a robust modern coin may put pressure on an archaeological coin with a weak edge or detached surface.
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CCI recommends inert polyethylene or polystyrene containers for coins. Rehouse coins kept in PVC holders because PVC can contribute unwanted chemical exposure over time. CCI also cautions that archaeological coins may be too fragile for Mylar holders or flips. There is no single holder style that is safe for every dug coin: the conservator’s assessment should determine whether the coin needs a loose container, a cushioned support or a different enclosure.
Prevent contact and contamination
- Keep the coin from direct contact with dissimilar metals. Contact between different metals can contribute to corrosion.
- Use a clean, dry storage environment and keep pollutants and salts away from the object.
- Do not force a fragile coin into a tight pocket, snap or flip. Pressure can break edges or lift corrosion.
- Store each coin so loose soil or corrosion cannot rub against another object.
- Label the container with the coin’s identification and treatment history so a future handler knows what was done and what remains attached.
Use humidity numbers in context
CCI’s metal-storage note says that no corrosion should occur on most stable metal objects in a mixed collection at or below 55% relative humidity, while warning that some airborne pollutants can still tarnish silver or corrode lead. That is a general collection-storage statement, not a guarantee for salt-contaminated archaeological coins. For those copper alloys, the 42% and 68% risk thresholds cited in the archaeological guidance are the relevant warning figures, and the object still needs a treatment plan rather than a do-it-yourself humidity experiment.
A practical decision path
- Is the coin from the ground and its surface uncertain? Preserve the as-found state, document it and seek assessment.
- Are there salts, concretions, powder, flaking or deep pits? Do not dry, scrape or wash it. Keep the context and contact a conservator.
- Does it appear sound, with only loose dirt and no active-looking deposits? Ask whether it is suitable for routine handling. Only then consider the limited distilled-water-and-diluted-soap wash.
- Did the surface react during the wash? Stop, leave the new material in place and obtain professional advice.
- After treatment, is the coin robust or fragile? Select an inert polyethylene or polystyrene container or another support recommended for its condition. Do not assume a Mylar flip is suitable for an archaeological coin.
- Are you storing a salt-contaminated copper alloy? Treat humidity control as a conservation requirement, not as a generic household storage target.
What to ask a conservator
When arranging an assessment, provide the photographs, recovery context, dates and a description of anything you tried. Ask whether the visible material is soil, stable tarnish, active corrosion, a concretion, a salt product or an old coating; whether the coin is safe to handle; and what temporary humidity and packaging conditions are appropriate. Ask for written handling and storage instructions if the coin will be moved, displayed or transferred to another collection.
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- Coin cleaner, mild and free from strong irritating elements, it is compatible with the metal surface of coins during the cleaning process.During the cleaning process, an odor may be produced. It is recommended to wear a mask and gloves.
- Pour an appropriate amount of coin cleaner into a container, place the coins that need cleaning into it and let them soak for a while (the soaking time depends on the degree of metal corrosion). Then, gently clean the surface of the coins using warm water and tools such as a toothbrush. Finally, rinse them thoroughly with clean water.
- After cleaning, the surface of the coins becomes clearer, making it easier for collectors to identify the year, version, and minting process. The coins also appear brighter and smoother, providing a more pleasing visual experience.
- When placing coins in the cleaner solution for soaking, it is important to control the soaking time to avoid damaging the coins due to excessive exposure. Additionally, avoid using high-pressure water to directly rinse the coins, as this may cause impact and damage to them.
Do not assume a conservator’s first recommendation will be cleaning. Stabilization, documentation and a suitable enclosure may be preferable to removing deposits. The treatment decision should account for the coin’s alloy, the condition of each face and edge, the historical information in the deposits and the way the coin will be stored afterward.
What a conservator can establish
A conservator can distinguish deposits from original surface, assess whether corrosion is active, determine whether a coating or residue is present and choose a treatment that does not sacrifice surviving detail. That assessment is especially important when the coin’s visible colour conflicts with its likely alloy, when a green or red product is spreading, or when the object cannot be handled without shedding material.
Professional advice also prevents a common irreversible mistake: cleaning away the very layer that carries evidence of manufacture, burial or earlier treatment. The goal is not maximum brightness. It is a stable object whose remaining metal, design and historical information are still present.
Frequently Asked Questions
Can I clean a coin I found in the ground?
Only after documenting it and determining that it has loose surface dirt, not corrosion, salts, concretions or a fragile coating. CCI says corrosion removal should generally be left to a conservator.
How do I know whether green material is harmless dirt?
You cannot identify the alloy or diagnosis by colour alone. Copper in gold or silver alloys can produce green or reddish corrosion. Powder, spreading deposits, pits or lifting layers warrant professional assessment.
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No. CCI’s archaeological-collections guidance says metal objects covered in concretions or contaminated with salts should not be allowed to dry before conservation treatment. Contact a conservator for object-specific instructions.
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What is the safest home wash for a stable coin?
For a coin already judged suitable for routine handling, CCI describes lukewarm distilled water with diluted mild soap, no scrubbing, a distilled-water rinse and air-drying on a paper towel. Stop if the surface changes or any material moves.
Can I use acetone on a dug coin?
Do not add acetone yourself. CCI mentions it in a coin-care procedure for degreasing and dewatering, but an excavated coin may have fragile corrosion, coatings or unknown residues that require assessment first.
Are coin dips, polishing cloths or metal cleaners safe?
No. CCI states that coin dips and metal cleaners, including cloths, wadding, liquids and pastes, should not be used. Dips may contain acids, and many cleaners are abrasive.
What holder should I use?
CCI recommends inert polyethylene or polystyrene containers and rehousing coins stored in PVC. Fragile archaeological coins may be unsuitable for Mylar holders or flips, so choose the enclosure after assessing condition.
What humidity is safe for a copper coin?
There is no universal target for every coin. CCI reports moderate corrosion risk for salt-contaminated copper alloys above 42% relative humidity and very high risk above 68%; those figures do not automatically apply to uncontaminated copper or other metals.
The Bottom Line
Document a ground-found coin, leave corrosion and concretions in place, and seek a conservator whenever the surface is fragile, powdery, pitted, salt-contaminated or uncertain. Use only the limited CCI wash for a stable coin already judged suitable for routine handling, avoid dips and abrasives, and store the result in condition-appropriate inert housing.
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