Highlights
- Fining is a winemaking treatment that adds a substance to wine or grape juice to bind selected compounds.
- The resulting particles can settle or be removed, helping with clarity, haze and some sensory adjustments.
- Fining is different from settling, racking and filtration, although winemakers may use these processes together.
- Fining agents can be mineral, plant-derived, synthetic or animal-derived.
- Unfined means no fining agent was used. It does not necessarily mean cloudy, unfiltered, natural or unfinished.
- A wine’s appearance cannot tell you whether animal-derived fining agents were used.
- If vegan suitability matters, check current producer information or a credible certification claim.
Quick answer: what is fining wine?
Fining is the addition of a material to wine or grape juice so it binds, adsorbs or reacts with selected compounds. This creates particles or complexes that are easier to separate from the wine by settling, racking or sometimes filtration.
Winemakers may fine wine to improve clarity, reduce haze, soften excessive bitterness or astringency, adjust colour, or manage selected phenolic compounds. The effect depends on the fining agent and the wine. Fining is a targeted winemaking choice, not an automatic sign that a wine is better or worse.
A simple way to picture it is a selective clean-up step: the fining agent is chosen to interact with particular unwanted or excessive components, rather than simply removing everything in the wine.
How does fining work?
Wine can contain suspended particles, haze-forming proteins and other compounds that are too small or dispersed to settle quickly. A fining agent interacts with some of these materials through physical or chemical processes such as binding, adsorption or precipitation.
The resulting material becomes larger or denser and can separate from the wine. The clearer wine may then be left above the sediment, transferred away from it, or passed through another separation step.
Fining is not a single-purpose treatment. Depending on the agent and the wine, it can affect:
- clarity and haze;
- bitterness and astringency;
- selected tannins and other phenolic compounds;
- colour or browning-related compounds; and
- in some circumstances, aroma, flavour, body or texture.
These effects are not guaranteed. A fining agent that helps one wine may be unsuitable for another, and excessive or poorly targeted fining can remove desirable character as well as unwanted compounds.
Why do winemakers fine wine?
The most familiar reason is clarification: making wine look bright rather than hazy. But appearance is only part of the story.
Fining may also be used to reduce the risk of particular haze problems, adjust an overly bitter or astringent sensation, or manage selected colour and phenolic compounds. In some wines, it forms part of a broader approach to stability and finished-wine presentation.
That does not mean every hazy-looking wine has a fault, or that every clear wine has been fined. Winemakers can use different combinations of settling, racking, filtration and other decisions to reach the desired result.
Common fining agents
Fining agents are not interchangeable. Each has different properties and is selected for a particular wine and purpose.
Mineral and inorganic agents
Bentonite is a clay-based material commonly used to help clarify wine and reduce the risk of protein-related haze, particularly in white wines.
Activated carbon can reduce colour and some unwanted odours. It can also remove desirable character if used inappropriately, so it is a targeted material rather than a general-purpose polish.
Other silica-based and related materials may be used in clarification systems.
Animal-derived protein agents
Some traditional fining agents come from animal-derived materials. Examples include:
- gelatine, which can help reduce compounds associated with bitterness and astringency;
- isinglass, a collagen-based material commonly associated with clarifying white wines;
- egg white or egg albumen, often used to help soften harsher tannin in red wine; and
- casein or skim milk, which can assist with selected phenolic or colour-related adjustments.
These examples explain why a wine’s production method can matter to people who avoid animal products. They do not, by themselves, tell you whether a measurable residue remains in the finished wine.
Plant-derived and synthetic materials
Plant-protein fining aids may be used as alternatives to animal-derived proteins. PVPP, a synthetic polymer, can target some phenolic compounds associated with browning, pinking and astringency.
“Mineral”, “plant-derived” and “synthetic” describe broad material categories. They do not predict an identical result in every wine, and they should not be treated as automatic shorthand for quality or suitability.
Fining versus settling, racking and filtration
These terms describe related but different parts of winemaking:
| Process | What it does |
|---|---|
| Fining | Adds a targeted material that interacts with selected wine compounds. |
| Settling | Allows suspended solids to fall under gravity. |
| Racking | Transfers clearer wine away from sediment or lees. |
| Filtration | Passes wine through a filter medium that retains particles. |
Fining can be followed by settling and racking, and sometimes by filtration. A wine may therefore be both fined and filtered. On the other hand, not every fined wine is filtered, and not every filtered wine has been fined.
For a deeper explanation of the overall production sequence, see how wine is made. The separate guide to filtering wine covers filtration in more detail, while racking wine focuses on transferring wine away from sediment.
What does “unfined” mean?
An unfined wine is one made without using a fining agent. It does not necessarily mean the wine is cloudy, unfinished or unsafe.
Unfined wine can still be clear because fining is not the only route to clarification. Settling, racking, filtration and time may all contribute to the wine’s appearance.
The term also does not automatically mean:
- unfiltered;
- natural;
- organic;
- biodynamic;
- vegan; or
- higher quality.
“Unfined” tells you about one production decision. It does not describe the whole philosophy or quality of the wine.
Does fining affect whether wine is vegan?
It can. Animal-derived fining materials include gelatine, isinglass, egg and milk or casein products. However, vegan suitability cannot be worked out reliably from the wine’s colour, clarity or texture.
A clear wine may be vegan, or it may have been made using an animal-derived fining agent. An unfined wine may be vegan, but “unfined” alone does not establish that every part of its production meets a particular vegan standard.
Wine Australia says that “vegan” and “vegetarian” are not defined wine-labelling terms under its guidance. It also explains that these are assurance claims that must be accurate, not misleading and supported by a factual basis.
If vegan suitability matters, check the producer’s current information or a credible certification mark. Treat an old product description or a wine’s appearance as insufficient evidence.
Australian labelling context
Australian wine labelling and processing-aid requirements depend on the current Australia New Zealand Food Standards Code and the circumstances of the product. Wine Australia’s guidance identifies prescribed allergen terms that can apply to wine, including “sulphites”, “egg” and “milk”.
Wine Australia also notes a wine-specific exemption concerning fish derived from isinglass under the cited Australian requirements. This is a specific labelling point, not a reason to assume that every processing aid is irrelevant to every consumer or market.
Processing aids can be treated differently from ingredients under food-labelling rules, and allergen provisions can affect the outcome. Requirements and guidance can change, so anyone making an allergy or compliance decision should check current Wine Australia and Food Standards Australia New Zealand information rather than relying on a general article.
The takeaway
Fining is a selective winemaking treatment: a material is added to interact with particular compounds so they can separate from the wine. It may help with clarity, haze, bitterness, astringency, colour or other targeted adjustments, but it is not required for every wine and is not a universal measure of quality.
The most useful consumer distinction is simple: unfined does not mean unfiltered, and clear does not necessarily mean fined. If animal-derived materials or vegan suitability matter to you, look for current, reliable producer or certification information.
Suggested FAQs
Is fining the same as filtering?
No. Fining uses a material that interacts with selected compounds, while filtration physically retains particles as wine passes through a filter medium. Both may be used, either separately or together.
Is unfined wine always cloudy?
No. An unfined wine can still be clear through settling, racking, filtration and other winemaking choices.
Are all fining agents animal-derived?
No. Fining agents can also be mineral, plant-derived or synthetic. Bentonite, PVPP and activated carbon are examples of non-animal materials.
Is all unfined wine vegan?
No. “Unfined” describes the absence of a fining agent, not necessarily every material or contact involved in production. Check current producer or certification information.