You can prevent most brass tarnish with four habits. Keep the piece dry, dust it instead of polishing it, stop skin oils from reaching the metal, and store it in a cool, low-humidity place. For a longer-lasting barrier, seal the surface with a thin coat of conservation-grade wax or a lacquer. Which of those fits depends on how your piece was finished and how much you want to fuss over it.
We make brass ornaments and nativity pieces, so we think about this every holiday season: how to unwrap a piece in December and have it look as good as it did when it went into the box last January. This guide covers what causes tarnish, which protection to pick, how to store ornaments, and when to leave the darker surface alone.
TL;DR
- Tarnish comes from moisture, air pollutants and skin oils reacting with the copper in brass. Keeping pieces dry and clean slows it more than any product does.
- Dust gently and handle with cotton gloves. Frequent polishing is abrasive and wears away fine detail.
- A thin coat of microcrystalline wax is reversible and easy to renew. Lacquer lasts longer, but once it chips, the damage is harder to fix.
- For storage, keep ornaments in a cool, dry spot, ideally below about 35% relative humidity, with conditioned silica gel in a sealed container.
- A soft, darker patina is not a flaw. Green, powdery spots are different, and need a professional look.
Table of Contents
- What actually makes brass tarnish
- The everyday routine that does most of the work
- Wax or lacquer: choosing a protective barrier
- Be careful with polishes and home remedies
- Storing brass ornaments between seasons
- When to leave the patina alone
- Our perspective: brass is meant to be enjoyed
- Keeping our lobster nativity pieces looking their best
- A yearly care calendar
- FAQ
- Sources
What actually makes brass tarnish
Brass is a copper-zinc alloy. Copper is the part that reacts. Conservation guidance describes brass and bronze as copper alloys that are affected by chlorides and pollutants in the air, and as copper meets moist air it forms a surface film. The rate depends on conditions. A technical bulletin on brass and bronze finishes notes that oxidation can happen rapidly or slowly depending on the conditions the material is exposed to.
For a holiday ornament, three things do most of the damage:
- Moisture and humidity. A damp basement, a humid attic in July, or a hanging spot near a steamy kitchen all speed things up. Research on copper-alloy corrosion points to keeping relative humidity around or below 35% to restrain the ionic movement that drives corrosion, and notes that humidity spikes can trigger rapid change.
- Skin oils and fingerprints. The Canadian Conservation Institute lists grease, dust, polish residues and fingerprints among the sources of corrosion that cleaning removes. Every time you pick up a bare brass ornament, you leave a small amount of acid and salt behind.
- Chemicals. Perfume, sunscreen, bug spray and bleach all shorten the time before brass dulls. Hand lotion on the hands of whoever hangs the tree counts too.
The point is that tarnish is a reaction with the surroundings, not a defect in the piece. You prevent it by changing the surroundings.
The everyday routine that does most of the work
Before you reach for wax or lacquer, get the basics right. They cost nothing and apply to every piece.
Dust, don’t polish
A dry, soft cloth removes the dust and pollutant film that tarnish feeds on. Guidance for architectural metal maintenance discourages frequent polishing, because it is an abrasive process that removes small amounts of metal and can damage fine surface details over time. On a small ornament with sculpted claws, shells or a lobster’s textured shell, those details are the whole point.
Handle with cotton gloves
Cotton gloves keep skin oils off the surface. They sound fussy, but you only need them twice a year, when you hang the ornaments and when you pack them away. Keep a pair in the box.
Keep chemicals away
Put on perfume and sunscreen before you handle brass, not after. Don’t spray cleaners, air freshener or insecticide near a display shelf.
Dry it right away if it gets wet
If a piece gets damp from a window, a humid porch or a clumsy hand, dry it straight away with a soft cloth. Water spots on brass are tarnish waiting to happen.
Wax or lacquer: choosing a protective barrier
If you want to go beyond the basics, the idea is to put a physical barrier between the metal and the air. Guidance summarized by Martha Stewart’s brass care article treats lacquer as the long-term standard for sealing metal from air, while waxes give a layer you can reapply without stripping the surface. Here is how the two compare for a collector.
| Microcrystalline or carnauba-based wax | Lacquer | |
|---|---|---|
| Protection | Moderate, needs renewing | Longer-lasting while intact |
| Reversible | Yes | Only by stripping the old coat |
| Look | Keeps the metal’s natural feel | Glossy, sealed look |
| Weak point | Wears off with handling | A scratch or chip lets moisture in |
| Best for | Ornaments you handle each season | Display pieces rarely touched |
| Upkeep | Reapply thin coat now and then | Little, until it fails |
Applying wax
The Canadian Conservation Institute describes a straightforward method in its notes on cleaning, polishing and waxing brass and copper. Apply a thin, even coat of conservation-grade microcrystalline or carnauba-based paste wax, let the solvent evaporate, then buff gently with a lint-free cloth. Always test on an inconspicuous spot first, because wax can react with some finishes.
Thin is the key word. The same guidance warns that excess polish or wax residue can attract dust and moisture, which speeds tarnish instead of stopping it. A film you can barely see is better than a thick coat. Professionals sometimes use heat to melt wax into recesses, but that is a step to skip at home. Heat can damage the finish underneath.
The catch with lacquer
Lacquer is attractive because you apply it once. The trade-off is what happens when it fails. Metal hardware maintenance guidance says that once a lacquer coating is scratched or chipped, moisture can get under the barrier and cause black spots, and the usual fix is to strip the entire old finish and apply a new one. If a piece is already lacquered, treat it gently: wipe with a barely damp cloth, skip polish, and don’t scrub.
A practical point: before you wax anything, find out whether it is already lacquered. A lacquered surface feels smooth and glassy, and it won’t tarnish evenly. If you are unsure, ask the maker. For our own pieces, our brass ornaments collection is the place to start, and you can write to us with questions about a specific ornament.
Be careful with polishes and home remedies
A lot of the advice online involves vinegar, salt and flour pastes, ketchup or lemon juice. They do work on tarnish: the acid in a vinegar paste dissolves the metal oxides behind the dull film. But removing tarnish is not the same as preventing it, and these methods carry risks for small decorative pieces.
- Acid left in crevices. The Canadian Conservation Institute cautions that commercial polishes often contain ammonia or harsh acids, and traces left in recesses can accelerate corrosion later. Experts prefer abrasive-free methods such as mild detergent for collectible pieces.
- Vinegar needs care. A Real Simple guide to cleaning brass says the type of brass and finish determines how and when to clean, and that vinegar should be used cautiously. Rinse and dry thoroughly.
- Over-polishing. Every pass with a polish takes off a little metal. Clean only when you must.
If an ornament needs cleaning, use warm water with a drop of mild dish soap on a soft cloth, rinse with a barely damp cloth, and dry at once. Only then consider a thin wax coat.
Storing brass ornaments between seasons
Ornaments spend about eleven months of the year in a box, so storage is where most tarnish prevention really happens. Here is a simple routine.
- Clean and dry first. Dust each piece and let any moisture evaporate. Packing away fingerprints is how you find dull spots next December.
- Wear cotton gloves while you wrap.
- Wrap each piece separately in acid-free tissue or soft cloth, so the pieces don’t scratch each other.
- Seal them in an airtight container or zip bag. A maker’s care guide for brass ornaments suggests keeping them away from heat and air, in an airtight bag, somewhere cool.
- Add conditioned silica gel. Extension guidance on preserving metal items notes that silica gel in a sealed container is effective, as long as it is conditioned to a low-humidity state, ideally below 35% relative humidity.
- Pick the right room. A bedroom closet beats a garage, an unfinished basement or a hot attic. Those spaces swing between damp and hot, which is exactly the pattern that speeds tarnish.
The original packaging often helps too. Our nativity sets ship in lobster trap packaging, which makes a handy, sturdy keepsake box. Slip in a sealed bag of silica gel and the set is ready for next year.
When to leave the patina alone
There is a common idea that brass must always look bright. Conservators disagree. The Canadian Conservation Institute’s guidance on brass notes that some collectors prefer a natural, stable patina, and that polishing every piece down to bare metal can lower its historical and economic value.
For a novelty ornament, the call is personal. Some people love a bright, golden shine on the tree. Others like the warm, softened tone that comes after a few Christmases, the way a lobster trap looks after a few seasons on the Maine coast. Both are fine. Decide before you start polishing, because you can’t un-polish.
Tarnish versus something more serious
Ordinary tarnish is a dull, brownish or darker film. If you see green, powdery spots, especially in humid storage, take that seriously. Conservators warn that this can be the start of bronze disease, an active corrosion that is self-sustaining in high humidity. A quick wipe won’t fix it. If a valued piece develops green powder, isolate it from other brass, keep it dry, and ask a professional conservator or a metals restorer to evaluate it before you try anything yourself.
Our perspective: brass is meant to be enjoyed
We make these pieces by hand in a small New England studio setting, and we think of them as things to hang, hold and pass around, not things to lock in a case. That shapes our advice.
First, don’t be afraid of fingerprints on the day you unwrap an ornament. Clean hands, a dry cloth, and gloves when you pack it away will take you most of the way. Second, we would rather you dust gently every year than polish hard every few years. The detail on a small lobster figure is shallow, and abrasion is permanent. Third, if you love a bright finish, a thin wax coat that you renew is easier to live with than a sealed coating you can’t undo.
Most of all, an ornament that picks up a little character over the years is doing what a family heirloom does. A set of lobster nativity figures that has hung on your tree for a decade tells a story that a factory-fresh one can’t.
— Christopher
Keeping our lobster nativity pieces looking their best
If you are reading this because you own, or are thinking of buying, one of our brass pieces, everything above applies. Our lobster nativity ornament, the Mary, Joseph and Baby Jesus family ornament and the Three Wise Men ornament are small, detailed pieces, which is why we recommend gentle dusting over polishing. If you want the full scene, the Lobster Nativity Scene set comes with hand-painted, movable figurines in lobster trap packaging that doubles as storage. For gift ideas that go beyond brass, our guide to unique Christmas ornament styles, including coastal keepsakes is a good next read.
A yearly care calendar
If you like a plan, this one takes about fifteen minutes a year.
| When | What to do |
|---|---|
| Late November | Unwrap with gloves. Dust each piece with a soft, dry cloth. Hang away from candles, steam and sprays. |
| During the season | Dust lightly if needed. Wipe away fingerprints with a dry cloth. Avoid perfume and hand lotion when touching pieces. |
| After New Year | Dust, let pieces air dry if they are damp, and add a thin wax coat if you use one. Buff gently. |
| Packing | Wrap each piece in acid-free tissue, seal in an airtight container with conditioned silica gel, and store somewhere cool and dry. |
| Mid-year | Check the box. If you see green powder or dampness, act early. |
FAQ
Does brass always tarnish?
Unprotected brass will tarnish over time, because the copper in it reacts with air, moisture and skin oils. How fast depends on where it lives and how it is handled. A dry, dusted, gloved and well-stored ornament can stay bright for a very long time.
Is wax or lacquer better for preventing brass tarnish?
Lacquer is usually considered the longer-term barrier, but a scratch or chip lets moisture in, and fixing it means stripping the whole coating. Microcrystalline wax protects less durably but can be renewed without stripping, which many collectors find easier. Test either one on a hidden spot first.
Can I stop brass oxidation with household products?
Vinegar, lemon and similar pastes remove existing tarnish, but they don’t prevent it, and acid left in crevices can cause trouble later. Mild soap and water followed by thorough drying is safer for decorative pieces. If you want a barrier, use a thin coat of conservation-grade wax.
What should I do if my brass ornament has green spots?
Green, powdery spots can signal active corrosion rather than simple tarnish, particularly in humid storage. Move the piece away from other brass, keep it dry and don’t scrub it. Ask a professional conservator or metals restorer to look at it.
Sources
- Canadian Conservation Institute: Cleaning, polishing and protective waxing of brass and copper
- Canadian Conservation Institute: Preventing and treating the dezincification of brass
- NF94-139 Preservation of Metal Items (University of Nebraska extension)
- Bronze Disease: An Electrochemical Explanation
- Architectural metal cleaning and maintenance guidelines (FHC)
- Cleaning and preventative maintenance tips for brass (FHC)
- Technical bulletin: maintenance of brass and bronze metal finishes
- How to Clean Brass, According to Experts (Martha Stewart)
- How to Clean Brass So It Looks Shiny and New (Real Simple)
- Caring for your brass ornaments (Tom Pollard Designs)