Fermented shark smell is ammonia, and the shark produced most of it from its own flesh. Greenland sharks carry high levels of urea and a compound called trimethylamine oxide in their meat. During the long cure, bacteria break both down into ammonia gas, which is why one plate of hákarl at a tasting party can leave your kitchen smelling like an open bottle of glass cleaner for days.
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If you have already tried the usual fix, you know how it went. You opened a window and lit whatever candle was in the drawer, and the next morning the ammonia was still there with a coat of vanilla on top. That fix failed for a reason that makes sense once you know what the smell is made of, and the reason points to a better order of steps. The candle belongs at the end of that order, and when you get there, a pure beeswax candle from our collection of beeswax candles with wooden wicks keeps the cleared room smelling fresh, because it burns without paraffin soot or toxic fragrance to tangle with the last traces.
The smell is a gas, and your fridge cannot hold it
Sharks keep urea in their tissue to stay balanced in salt water. Fresh Greenland shark meat holds a lot of it, along with trimethylamine oxide. When the meat cures, bacteria feed on both compounds and release ammonia, and a study of hákarl chemistry in PubMed Central traces the sharp smell back to that process.
The cure itself is slow. The shark traditionally ferments for 6 to 12 weeks under gravel, then hangs to dry for several more months. The Slow Food Foundation's Ark of Taste entry on fermented shark records it as a traditional Icelandic food. By the time it reaches your table, the meat has been giving off ammonia for months.
Ammonia molecules are tiny. They pass straight through a thin plastic bag, even one knotted twice, so leftovers in the fridge keep leaking. Every time the door opens, a fresh wave rolls into the kitchen.
Heat speeds all of this up. Warming hákarl indoors, even setting the plate near a hot stove, pushes the gas out of the meat much faster. So the gas gets loose no matter how careful you were, and the next question is where it goes once it leaves the bag.
Where the ammonia settles after the shark is gone
Ammonia floats through the room and soaks into anything soft, which is why wiping the counter barely changes how the kitchen smells. Curtains and couch cushions take in the most. Over a long evening, the gas also works its way into carpet and painted drywall.
Those surfaces then give the smell back slowly. As the room warms in the afternoon, or as someone sits down on the couch, trapped gas releases into the air again. That is why the kitchen can smell fine at night and sharp again by lunch.
The fridge holds on too. The rubber seal around the door absorbs odor, and it puffs that smell back out with every opening. This is the part of the problem a candle can never reach, and it explains why the candle you lit the first night seemed to do nothing at all.
Why the sweet candle made the kitchen smell worse
Picture the morning after. You walk into the kitchen for coffee and get ammonia first, then a wave of frosting from the jar candle you burned before bed. Your nose reads them as two separate smells sitting side by side, and the mix is harder to ignore than either one alone.
Part of that comes from the scent, and part comes from the wax. Most cheap candles are paraffin. Crude oil gets refined into fuels and lubricating oils, and the wax that separates out along the way is cleaned up and sold for candles. Paraffin is petroleum waste, and research has shown that burning it releases compounds such as benzene and formaldehyde, along with dark soot.
The fragrance matters just as much. Many candles use toxic fragrances that contain phthalates, chemicals added to make a scent cling and last. A heavy sweet perfume built that way adds its own load to air that already smells of fish and ammonia.
A cool green scent behaves differently next to a sharp smell. Think of tearing a handful of mint leaves for a drink, and how that cold smell jumps up out of the glass. Mint and citrus are the profiles people reach for most against sharp, fishy odors, because the nose reads them as clean.
That cold mint smell is what our Slice of Life beeswax candle for the kitchen is built on, with notes of Spearmint, Eucalyptus, Tomato Leaf, Anise, Mint. It is poured in 100% beeswax with wooden wicks and phthalate-free fragrance, so the flame adds a fresh scent without paraffin soot. Even so, it can only freshen air that is already mostly clear, which is why the cleaning comes first.
Clearing the source, ranked from the step you tried to the one nobody checks
These steps run in the order most people try them. The last one sits last on purpose, because it is the step almost everyone skips, and skipping it is why the smell keeps coming back.
1. Air the room out
Open windows on opposite sides of the space so air moves through it. A box fan in one window, pointed outward, pulls the gas out faster than an open window alone. This clears what is floating in the air, though the ammonia inside fabrics and the fridge seal stays put.
2. Set out bowls of white vinegar
Ammonia is alkaline and vinegar is mildly acidic, so the two react when they meet. Set a few shallow bowls of white vinegar around the kitchen and leave them for several hours. Swap in fresh vinegar if the smell is still strong the next day.
3. Treat everything soft
Wash what you can, starting with dish towels and anything that covered the table. For carpet and couch cushions, shake baking soda over the surface, leave it overnight, then vacuum. If the smell has settled in deep, repeat the baking soda across a few days.
4. Wipe the hard surfaces where the shark sat
Clean the cutting board and the counter around it with warm soapy water. Then wipe once more with diluted vinegar. Wood boards hold smell longer than glass, so give a wooden board a second pass.
5. Find the leftover, then fix the fridge
Ask whether any hákarl is still in the house. A piece wrapped in a thin bag will keep leaking no matter how many bowls of vinegar you set out. Move it into a glass jar with a tight lid, or seal it in a rigid container and take it out of the building with the trash.
Then wipe the rubber gasket around the fridge door with a vinegar and water mix, working into the folds. Leave an open box of baking soda on a shelf. When the kitchen smells like nothing in particular, it is ready for the step most people try first.
Then the candle, once the room is clear
By now you can see where this lands. The best candle to remove fermented shark smell is a pure beeswax candle with a cool mint or bright citrus scent, lit after the source is gone and the fabrics are treated. The cleaning removes the smell, and the candle keeps the room smelling fresh while the last traces fade.
Those last traces are real. Even after a good cleaning, fabric and drywall can give off small amounts of ammonia for a few days. A clean candle lit in the evening gives the room a fresh scent to hold during that stretch, so the kitchen smells like your kitchen again.
The wax matters most at this stage. Whatever the candle burns becomes part of the air you just worked to clear, so the next choice is what that wax is made of.
The wax sets the floor for everything the candle adds
Three waxes fill most candle shelves. Here is how they compare on what reaches your air.
| Paraffin | Soy blend | MBur 100% beeswax | |
|---|---|---|---|
| Where the wax comes from | Petroleum byproduct of oil refining | Hydrogenated soybean oil, often blended with paraffin | Made by honeybees, a byproduct of honey production |
| Wick | Often cotton, some with metal cores | Usually cotton | Wooden wick, two on the 12 oz size |
| Burn behavior | Low melting point, burns fast | Soft wax, low melting point | Highest melting point of candle waxes, 40 hours on the 5 oz and 80+ hours on the 12 oz |
| Soot and emissions | Dark soot; research has shown it releases benzene, toluene and formaldehyde | Lighter, more when blended with paraffin | Clean burn, no paraffin soot |
| Fragrance | Often toxic fragrance with phthalates | May use toxic fragrance | Phthalate-free fragrance |
| Dye | Often chemical dye | Often chemical dye | No chemical dye |
| Where it is made | Mass produced | Mass produced | Hand poured in New York City |
Beeswax is the oldest candle material, used since around 5,000 BCE, and it needs no chemical processing to become a candle. Its high melting point keeps the flame steady and slow. Paired with phthalate-free fragrance, it adds a fresh scent to a room without adding petroleum compounds to the air you just cleared.
That settles the wax. What is left is a fit question: which scent and which size suit the room that held the shark.
Which scent and which size for the room that held the shark
For the kitchen itself, mint is the strongest match. Slice of Life opens cold and green, the smell of crushed spearmint with a clean eucalyptus lift, and it reads as fresh in a room where food was just served. Light it after dinner on the first few nights following the cleaning.
For the living room, or wherever guests sat with their plates, citrus works well. Our Adi citrus beeswax candle carries notes of Lemon, Orange, Grapefruit, Mandarin, Tangerine, Lime, Peach, Agave. Citrus is one of the profiles most often used against sharp, chemical-like odors, and a bright citrus scent makes a sitting room feel aired out and awake.
“Theres nothing I hate more than a candle that can't fill the room and baby this is NOT that. This candle permeates every corner of the room.”
Tiffany Gordon, MBur customer
Size follows how often you will light it. The 12 oz candle has two wooden wicks and burns 80+ hours, which suits an open kitchen or a room you will light most nights while the last traces fade. The 5 oz candle has one wooden wick and burns 40 hours, the right fit for a small galley kitchen or a room you only use some evenings.
If you are still arguing with this
“I lit a candle that same night and nothing changed.”
That candle was up against a source that was still leaking. A leftover in the fridge or a couch full of ammonia keeps feeding the air, so any candle lit that night was outmatched. Once the source steps are done, the same evening candle does what you wanted it to do the first time.
“Another candle on the shelf says it eliminates odors.”
No candle pulls ammonia out of a cushion or a fridge seal, whatever the label says. The cleaning does that work. After the cleaning, the only question left is what the candle adds to your air, and 100% beeswax with phthalate-free fragrance adds a fresh scent with no paraffin soot.
“My kitchen opens straight into the living room.”
An open plan is a size question. Choose the 12 oz size with two wooden wicks for the kitchen end, since two flames melt a wider pool and carry scent farther across a big space. If the seating area is far from the stove, Adi on the coffee table keeps that side fresh too.
Burning it so it keeps the room fresh
On the first burn, let the wax melt all the way to the edge of the jar. Beeswax remembers its first melt pool, and stopping early leaves a tunnel that wastes wax and weakens the scent. Plan on a couple of hours that first time.
After that, burn for one to four hours at a time. Trim the wooden wick to about an eighth of an inch before each light and brush away the charred bits, which keeps the flame steady and clean.
Fresh air still helps. Keep a window cracked across the room from the candle, since a draft blowing on the flame makes it flicker and burn unevenly. Never leave a lit candle alone, and keep it out of reach of pets and kids.
Questions people ask after a hákarl night
Will a candle get rid of fermented shark smell on its own?
A candle cannot draw ammonia out of fabric or a fridge seal, so the cleaning has to happen first. Once the source is gone, a clean mint candle like Slice of Life in pure beeswax keeps the kitchen smelling fresh while the last traces fade over the next few days.
Why does my fridge still smell like hákarl after I threw it out?
The rubber door seal absorbs ammonia and releases it every time the door opens. Wipe the folds with vinegar and water and leave an open box of baking soda inside. Once the fridge is clear, light the Adi citrus candle nearby for a bright, fresh scent.
Is mint or citrus better after eating hákarl?
Both read as clean next to a sharp smell. Mint suits the kitchen, which is why the Slice of Life mint candle is our pick for that room, and citrus suits a living room where guests sat.
Does heating fermented shark make the smell worse?
Yes. Warm meat gives off ammonia much faster, so serve hákarl cold and keep it away from the stove. If someone warmed it anyway, run the source steps first, then burn Slice of Life with its wooden wicks in the evening once the air has cleared.
The candle for your kitchen after a hákarl night
Fermented shark smell is ammonia gas, so it has to be cleared at the source before anything else can help. Find the leftover that is still leaking, then treat the air and the fabrics. After that, a pure beeswax candle keeps the room fresh while the last traces fade.
For the kitchen, pick the 12 oz Slice of Life beeswax candle, $65. It is the candle for the room you will light every evening that first week, and its cold mint opening makes the kitchen feel like yours again. The jar holds 100% beeswax and two wooden wicks for 80+ hours of burn. The notes are Spearmint, Eucalyptus, Tomato Leaf, Anise, Mint.
“They smell up a WHOLE room during the burn & even a while after blowing them out.”
Paige, MBur customer
The one reason to order now: you are doing the cleaning this week, so the candle can be ready on the counter the night the room is finally clear.
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