|
Pearson
Square (Wine fortification chart)
|
(alcohol
content of
fortifying spirit) |
|
(C-B)
the difference is the
fortifying spirit required |
| |
desired
alcohol content of
fortified wine |
|
| alcohol
content of existing wine |
|
(A-C)
the difference is the part of
wine to be fortified |
The
Pearson Square is used to determine the amount of spirit needed to fortify
a wine. It is necessary to know the percentage of alcohol by volume (v/v)
in the spirit to be used for fortification and also in the wine to be
fortified.
For
Example: Suppose the fortifying
spirit has a 40% alcohol content, the wine has 15%, and you want to add enough
spirit to increase the wine (e.g. port) to 20%.
Subtract B (15) from C (20); the remainder D (5) are parts of spirit to
be used in the mixture. Subtract C (20) from A (40); the remainder E (20) is
parts of wine to be used. You
will need 5 parts of spirit to 20 parts of wine to bring the mixture up to 20%
alcohol by volume.
The
same method can be used to calculate the alcohol content of two wines when
blended.
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