Fault
Pinking
An unexpected pink or salmon tint developing in a pale cider or perry, associated with oxidation of colourless phenolic precursors.
Also called pink cast, pink discolouration.
- Severity
- Cosmetic — looks wrong, tastes fine
- Where it starts
- Packaging, Blending, Stabilisation
- Can it be fixed?
- Yes, if caught in time
- When you notice it
- Packaging, Storage
- Signs
- 5 recorded
What it is
Pinking is the appearance of a pink, salmon or rose tint in a drink that should be pale gold. It is well documented in white wine and is met in cider and, more often, in perry. The pigment comes from colourless phenolic precursors present in the fruit that are converted to coloured forms, generally on exposure to oxygen after a period of protection. It has no effect on flavour and is unwelcome only because it looks unexpected.
What you notice
Grouped by sense, because that is how the fault presents itself rather than how it works.
To look at
- A pink or salmon cast in a cider or perry that was pale
How the batch behaves
- Colour appearing after bottling or after a treatment rather than during fermentation
- The tint deepening on exposure to air in an opened bottle
- Perry showing it more readily than cider from the same cellar
On the palate
- No accompanying change in aroma or flavour — A pink cider that also smells oxidised is describing two things, not one.
When it appears. In a finished, usually pale and lightly-handled cider, days to weeks after packaging. It is a bottle-shelf finding rather than a cellar one.
It is cosmetic and does not indicate a flavour change, which makes it one of the few faults on this list where the correct answer to a worried maker is that nothing needs doing.
What it is mistaken for, and how to tell
One observation per rival, chosen because it separates them rather than because it describes either. Several of these are not faults at all — a style feature, a normal outcome, or the fruit behaving as it does.
- Metal haze — Metal contamination casts grey or blue-grey and usually hazes; pinking is a pink or salmon shift in an otherwise bright cider.
- Colour from red-fleshed fruit — What went in. Anthocyanins from red-fleshed cultivars produce a genuine pink that was there from the press.
- Oxidation — Oxidation moves colour towards amber and brown; pinking moves it the other way.
What is actually happening
The chemistry or microbiology behind it. Understanding the mechanism is what makes the prevention make sense rather than being a list of rules.
The accepted account, developed for white wine and applied by analogy to cider, is that colourless phenolic precursors — leucoanthocyanidins and related flavan-3-ol derivatives — are converted under oxidative conditions to anthocyanidin-type pigments that absorb in the green part of the spectrum and therefore appear pink. The precursors are present in the fruit and are not themselves coloured.
The characteristic trigger is a change in redox conditions. A juice or cider that has been protected — by sulphite, by inert gas, by a reductive fermentation — and is then exposed to oxygen shows the effect most strongly. This is why pinking so often appears after bottling, after a racking, or in the glass rather than in the tank.
Some pear cultivars carry more of the relevant precursors than apples do, and perry is correspondingly more prone. Where a maker sees a rose tint in perry from a particular pear, that is often a property of the fruit rather than a sign of mishandling.
The mechanism should be reported with appropriate caution. It has been studied far more thoroughly in white wine than in cider, and the identity of the precursors and of the pigments formed in cider and perry specifically is less firmly established than the general oxidative account suggests. Sources differ, and CiderHQ does not claim more certainty than the literature supports.
How it happens
| Cause | Stage | How often |
|---|---|---|
| Oxygen exposure following a period of strongly protected, reductive handling | Packaging | occasional |
| Pear cultivars carrying more of the relevant phenolic precursors | Blending | occasional |
| Heavy sulphiting followed by a drop in free sulphur dioxide | Stabilisation | occasional |
| Certain red-fleshed or highly pigmented apple cultivars in the blendIn this case the colour is genuine anthocyanin from the fruit and is not pinking at all. | Blending | occasional |
| Fining or filtration changing the phenolic balance before packaging | Stabilisation | rare |
Can it be put right?
Most cider faults cannot be reversed. Where that is the answer it is given plainly — an honest 'this batch is what it is' is more useful than a procedure that will not work.
| Option | Effectiveness | What it involves |
|---|---|---|
| Accept the colour | Reliable | The most sensible answer in most cases. Nothing about the drink is impaired, and a faint rose cast in perry is not a defect that anyone but the maker is likely to mind. |
| Fine with polyvinylpolypyrrolidone or a similar phenolic-selective agent | Partial | Used in white wine to remove the precursors before the pigment forms, and to reduce it afterwards. Bench trial from the supplier’s guidance; it removes other phenolics too. |
| Blend with a paler batch | Partial | Straightforward dilution of the tint, if appearance is what matters. |
| Wait for it to fade | Unlikely to work | The pigments are reasonably stable and do not reliably disappear. |
CiderHQ gives no additive dosage figures. An addition is a food-safety decision that depends on legal limits, on the juice in front of you and on what you are protecting against, and the right figure comes from your supplier’s or regulator’s own guidance rather than from a general reference.
Preventing it
- Handle consistently with respect to oxygen rather than swinging between strongly protected and exposed states.
- Where a pale presentation matters, trial the fruit and the process on a small scale before committing a batch.
- Keep bottled cider out of light and stored cool, which slows the oxidative chemistry generally.
- Recognise that some pear and apple cultivars simply give a tinted drink, and plan the presentation around it.
Pinking is the mildest entry in this file and is included mainly so that a maker who meets it can stop worrying about it. The drink is unchanged; the colour is unexpected; and the correct response in almost every case is to leave it alone.
Where it does matter is commercially, because a pale cider that arrives on a shelf with a rose tint invites the assumption that something has gone wrong. That is a presentation problem rather than a quality one, and it is the reason white-wine producers take it seriously enough to fine against it.
It is worth distinguishing from genuine fruit colour. Red-fleshed apples and some pears contribute real anthocyanins to their juice, and a cider that is pink because of what went into it is not exhibiting a fault. The distinguishing feature of pinking proper is that the colour was not there at the start and appeared later.
The honest position on the mechanism is that the general account is well supported in white wine and less thoroughly worked out for cider and perry. The oxidative conversion of colourless precursors is the explanation the literature offers; the specific compounds involved in apple and pear are less firmly identified, and this record says so rather than borrowing certainty from a different fruit.
The compounds involved
Anthocyanins
The red pigments of apple skin and red-fleshed cultivars, which are colour rather than flavour and which fade quickly in a cider unless the pH is low.
Procyanidins
The condensed tannins of cider fruit, whose chain length — not their quantity — decides whether the mouth registers bitterness or astringency.
Epicatechin
The flavan-3-ol that apple procyanidins are almost entirely built from, and the most bitter of the phenolic monomers a cider contains.
Catechin
The minor flavan-3-ol of apple, present largely as the terminal unit of procyanidin chains, and consequently a useful analytical handle on chain length.
Total phenolics
The single number used to summarise everything phenolic in a juice, useful for comparing fruit and misleading whenever it is used to predict how a cider will taste.
Dissolved oxygen
Essential to a healthy yeast population at the start of fermentation and the principal enemy of a cider from the moment fermentation ends.
Sulphur dioxide
The antimicrobial and antioxidant on which most modern cidermaking depends, and whose effectiveness collapses as pH rises — which makes every sulphiting decision a pH decision first.
Where in the process it arises
Sulphite stabilisation
Managing free sulphur dioxide through maturation and at packaging so that a useful antimicrobial and antioxidant fraction survives into the bottle.
Fining
Adding a reactive agent that binds a target colloid and carries it to the bottom, chosen according to whether the problem is tannin, protein or a phenolic taste fault.
Bottling
Transferring finished cider into glass, where the dominant variable is how much oxygen the liquid picks up in the few seconds it takes to fill and close each bottle.
Oxidative maturation
Ageing a cider with a deliberate, measured oxygen supply so that tannins polymerise and soften and an aldehydic character develops on purpose, which is not the same thing as the oxidation fault.
Faults it is confused with
These present similarly. What separates them is set out on each page.
Oxidation
The cumulative effect of oxygen on finished cider: fruit aroma flattens, colour deepens towards amber, and a bruised-apple or sherry-like character replaces the fresh one.
Colour loss
A cider left noticeably paler than it should be, usually because fining, filtration or sulphite has removed the phenolic material that gave it colour.
Enzymatic browning
The rapid darkening of milled fruit and fresh juice as polyphenol oxidase converts phenolics to quinones, taking colour and some tannin structure with it.
Where this comes up in a guide
The link lands on the step where the fault arises rather than at the top of the pathway, because that is where the decision that causes it is taken.
What people ask next
Questions readers ask about the things this page mentions. Each one goes to the section that answers it rather than to a page written to receive the question.
- Is cider vegan — Cider itself is a plant product, but some producers clarify it with animal-derived finings such as gelatine, isinglass or chitosan. Vegan status therefore depends on the fining regime, which is why some ciders are certified and others are not.
- What is oxidation in cider
- Does cider contain sulphites — Most does. Sulphur dioxide is added to protect juice and finished cider, and fermentation itself produces a small amount even when none is added. European labels must declare it above 10 mg per litre.
- What are procyanidins in cider — They are the condensed tannins of apples: chains of catechin-type units whose length decides how much of the phenolic load reads as bitterness and how much as astringency. Two ciders with identical total tannin can taste nothing alike.
- What is enzymatic browning
- How is cider bottled
Where to go next
- The fault finder — Describe what you can smell and see, and narrow it down from the signs.
- All faults — Grouped by where they come from and how serious they are.
- Cider science — The chemistry and microbiology these faults come out of.
Sources
What this page rests on. Where a source is marked as registered rather than read, CiderHQ is recording that the body is authoritative on the subject without claiming to have worked through the document itself. See our evidence policy for what each state means.
The Science of Cidermaking and associated technical writing
Andrew Lea · reference work · passage verified 2026-08-24
Written by a food chemist who worked at Long Ashton on apple phenolics. Unusual among specialist cider writing in that it is primary-research-adjacent: the author is describing work he did, and cites the literature. This is why it is registered at tier 1 for chemistry while a general cider book is not.
Peer-reviewed literature on apple phenolics and cider sensory perception
Various journals · peer-reviewed literature · registered as competent for this subject
Registered as a class rather than as one paper, because the mechanisms CiderHQ describes — tannin chain length driving the split between bitterness and astringency, salivary protein precipitation, enzymatic browning — are established across many studies rather than resting on any single one. Individual papers are cited where a specific number is quoted.
Perry Pears
L. C. Luckwill and A. Pollard (eds), published for the National Fruit and Cider Institute by the University of Bristol, 1963 · reference work · bibliographic record verified, not opened 2026-08-25 · covers 1963
Bibliographic record verified on 2026-08-25 against Open Library, which records the work as Luckwill, 1963, published for the National Fruit and Cider Institute by the University of Bristol. The catalogue entry names Luckwill alone where the standard citation names Luckwill and Pollard as joint editors; CiderHQ keeps both names and records the discrepancy rather than silently following one catalogue. This is the foundational descriptive work on English perry pears and the ancestor of most later variety lists. No copy was opened: it is sixty years old, out of print, and held in research libraries rather than in open digital collections.