C9 - Red and Rose Winemaking - Micky - completed Flashcards
The vast majority of fruit used in red winemaking is…and… when they arrived the winery
- Destemmed
- Crushed
What do some red winemakers do after crushing?
Leave the grapes to macerate for a period at a low temperature
What is the term of the process keeping the red grapes soaked in low temperature after crushing?
Cold maceration/cold soaking
What is the purpose of cold soaking?
- To extract colour and flavour compounds as tannins are more soluble in alcohol, therefore not readily extracted before fermentation
Between what temperatures does red wine fermentation usually occur?
20C - 32C (depending on style)
Why are the temperatures of fermentation higher for red wine than for white?
It’s necessary to aid extraction of colour, flavour and tannin
Beyond what temperature should red wine fermentation not go? Why?
35C
This may kill the yeast
How may a red winemaker influence the amounts of colour, flavour and tannin extracted during fermentation?
By controlling the temperature precisely
How tannin extraction can be reduced in red wines?
By lowering the temperature towards the end of fermentation
What will happen to a fermenting red wine if left to itself?
A thick mass of pulp and skins will form on its surface
What is the mass of pulp and skins called, that forms on a fermenting red wine?
The cap
What will be the result if the cap is left to float on a wine?
Little colour, flavour or tannin will be extracted from it
How may the problem of the cap be managed?
Using cap management techniques
How may cap management techniques be used to control levels of extraction?
- By altering the duration of each technique
- By altering the number of times they are practiced each day
What is the traditional method of punching down?
The cap would be punched down by hand with paddles on the end of sticks
What was the big problem with the traditional method of punching-down?
There was a danger for the workers of CO2 intoxication
Why is the danger of manual punching-down not really a problem anymore?
The same effect can now be achieved with mechanical paddles
Which cap management technique is particularly effective at extracting colour and tannin?
Punching down
What is the potential problem when punching down, mechanical or otherwise? In which period it’s most important to consider and why?
- It can be too effective at extracting toom much colour and tannin
- At the end of fermentation
- Tannins are more easily extracted at this point
What is pumping over?
It involved drawing off juice from the bottom of the vat and pumping it onto the top of the fermenting wine
What are the side benefits in using pumping over?
Oxygenating the juice and dissipating heat
How “Rack and Return” works?
- The fermenting juice is drained from the vessel into another one, leaving the cap behind
- The juice is then pumped back over the cap
What is the disadvantage of Rack and Return? How is this managed?
- It can be very extractive
- It is only performed once or twice during a fermentation
What is the side benefit of Rack and Return, similar to pumping over?
Dissipating heat
Describe Rotary Fermentation
Fermentation takes place in rotating horizontal tanks
What is the intention of Rotary Fermentation?
To keep the juice in constant contact with the skins
What effect does cap management techniques have on the fermentation vessel that’s chosen?
They are usually large and open-topped
What kind of vessel should NOT be used for fermenting red wines? Why?
- Oak barrel
- It would be almost impossible to maintain sufficient contact between the skins and the juice
What is the main aim of post-fermentation maceration?
further extraction of tannin
Some winemakers have found that…can create a smoother tannin structure
Extended periods of post-fermentation maceration
What happens to red wine immediately after fermentation/maceration?
- The free run wine is drawn off the skins
- The remaining mass is pressed
What is press wine?
- The wine which is released from pressing the grape mass after fermentation (in the case of red wine)
Describe how press wine differs as it’s being pressed
- It is similar in composition to free run wine at the beginning, but becomes deeper in colour and higher in tannin as pressing continues
How is press wine managed by red winemakers?
They will usually separate the wine at different stages of pressing
What is the name for the wines separated at different stages of pressing?
Press fractions
What may press fractions be used for later in the process of red winemaking?
To adjust colour and tannin in the final blend
What is the main consideration for a winemaker when they are using whole bunches? Why?
- That the stems are fully ripe
- The unripe stems of a whole bunch may give the finished wine an undesirable bitter taste
What is the main reason for using whole bunches during fermentation?
To create an oxygen free environment for the uncrushed grapes
What are the two main outcomes of creating an oxygen-free environment for fermenting grapes?
- Intracellular fermentation
- Distinctive aromas are created within the berry
Define intracellular fermentation
Berries create alcohol within their cells without the involvement of yeast
List the three forms of whole-bunch fermentation
- Carbonic maceration
- Semi-carbonic maceration
- Whole bunches with crushed fruit
List the key stages of carbonic maceration
- Whole uncrushed bunches are placed into vats which are filled with CO2 to remove all oxygen
- Intracellular fermentation begins
- At 2% alcohol, the grapes begin to split and release their juice
- The grapes are pressed
- Yeast completes the fermentation off the skins
What is the key structural difference in wines made using carbonic maceration?
It extracts a lot of colour, but little tannin, the resulting wines are full of fruit.
What are the tell-tale aromas/flavours of a wine made with carbonic maceration?
Kirsch, banana, bubble gum and cinnamon-like spice
Describe semi-carbonic maceration?
- The vats are not filled with CO2
- The vat is filled with whole bunches
- The weight of the whole bunches crushes those at the bottom, releasing some juice
- Ambient yeast begin to ferment the juice at the bottom, filling the tank with CO2
- Remaining grapes undergo carbonic maceration as normal
- The ambient yeast complete the fermentation off the skins.
Name a notable wine style which is made using semi-carbonic maceration. How is this process different?
- Some premium Pinot Noirs
- Alcoholic fermentation continues on the skins
How is the winemaking process different when semi-carbonic maceration is used for premium Pinot Noir?
- Grape skins are progressively broken up during punching down
- An ever-decreasing amount of carbonic maceration takes place until all grapes are broken up
- alcoholic fermentation may continue on skins
- Post-fermentation maceration may take place
What is the potential result of the premium pinot noir approach to semi-carbonic maceration?
- It can result in a better integration of aromas from intracellular fermentation and the aromas from the grape variety
- Wine have a fresher fruit character
How is intracellular fermentation encouraged when whole bunches are mixed with crushed fruit?
- The whole bunches are submerged by the crushed grapes and kept away from oxygen, resulting in a lack of access to oxygen, although the vat is not blanketed in CO2.
How are the more ‘carbonic’ characteristics created when using whole bunches with crushed fruit?
By raising the percentage of whole bunches used
What are thought to be the outcomes of using a greater percentage of whole bunches with crushed fruit?
- Silkier texture
- Brighter, fresher fruit characteristics
What is the most important decision when it comes to pre-bottling maturation when making red wines?
The option of whether or not to use oak
Virtually all red wines undergo…
MLF
The generally more robust flavours of red wines mean they benefit less from ____ than white wines
Extended time on lees
Which maturation trend is now declining in red winemaking?
Maturing premium red wines in small, new oak barrels
What is the style that red winemakers are aiming for now? How are they achieving this?
- greater subtlety and integration
- By using oak vessels of different ages and larger sizes
A red winemaker’s best wines will be still often be…and with more…
- Aged for longer
- New oak
How will a red winemaker’s fruit usually reflect the quality of wine it’s intended to produce? Why should it be like this?
- The best wines will usually be made with a higher quality, more concentrated fruit
- To support a greater level of new oak flavours
What is blending used for in the making of red wine? Give examples
To enhance or balance out certain aspects of the wine, such as colour, body, tannin, acidity and flavour
What is used in red winemaking to boost colour, flavour and tannin in the more delicate free-run wines?
The use of different press fractions
Which blending practice may help to enhance the complexity of a red wine?
The blending of wines matured in oak vessels of different ages, sizes and toasting levels
How may blending be used to achieve a more subtle oak influence on a red wine?
The winemaker may blend wines matured in oak with wines matured in stainless steel or concrete vessels
Why might a red winemaker avoid clarification and/or stabilisation?
Some winemakers believe that these processes may harm the wine’s structure
How may clarity be achieved without filtration in a red wine before bottling?
By allowing gradual sedimentation through extended maturation
Describe the grape-growing areas responsible for high-volume, inexpensive red wines
They tend to be warm, sunny and dry
Which varieties tend to be used for high-volume, inexpensive red wines? Why?
- Those that can thrive in warm, sunny and dry conditions (e.g. Shiraz, Cabernet Sauvignon, Merlot, Grenache etc.)
- Growing areas for this category of wine tend to be warm, sunny and dry
What is the additional benefit of growing grapes like Shiraz/Merlot etc. for high-volume, inexpensive wines?
Why?
- They can produce fruity wines with adequate colour even at high yields
- Due to the concentration of colours and flavours in their skins
How may the high-volume examples of red wine grapes compare with their premium counterparts?
- They may display less colour, lighter tannins and less intense and complex aromas
- Distinctive characteristics may diminish, resulting in more homogenous wines
Name a black grape which is rarely used in high-volume, inexpensive wines
Why?
- Pinot Noir
- It’s hard to grow, prefers cooler climates and can be difficult to extract adequate colour and tannin at high yields
How may high-volume, inexpensive red wines be labelled? (give an example)
‘fruity red’
What is the broad flavour style in which high-volume red wines are usually made?
Fruity and low-tannin
How are fresh, fruity aromas retained in high-volume red wines?
The juice is handled protectively with SO2 levels being monitored throughout
What will usually happen to harvested red grapes for inexpensive wine once they arrive at a winery?
They’ll usually be destemmed and crushed
What adjustment will usually need to be made for inexpensive red wines?
Tartaric acid will usually be needed due to the warm growing climate where the grapes are grown
Which process may or may not occur just before fermentation when making inexpensive red wine? Why may it not be used?
- pre-fermentation maceration
- It can tie-up vat space and so may not be feasible in a high throughput winery
What kind of yeast will usually be used for inexpensive red wines?
Commercial yeast
What temperature will fermentation usually be performed at when making inexpensive red wine? With what aim?
- 22 - 25C
- To maximise fresh fruit aromas
Which fermentation vessels will be used for inexpensive red wines?
Variable (Static or rotary)