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