5 Gallon Grape (Started May 9, 2019)
Posted: Thu May 09, 2019 8:17 am
DAY ONE
(Variation on: https://www.baderbrewing.com/content/ho ... ble-grapes)
16# Frozen grapes & 12# Canned grapes (from 2010)
3 tsp pectic enzyme
1/4 tsp potassium metabisulfate
2 tsp yeast nutrient
2 gallons artesian or spring water (heated to 130 degrees)
pH strip test 3.2 before adding water.
Let all ingredients sit for 2 hours. Strain/squeeze grapes and toss them.
Let sit covered for 24 hours.
NOTES ON PH...
Unlike TA testing and adjusting, pH adjustments are not linear; if you add 1 g/L of acid to a wine or must you now have exactly 1 more g/L of acid in solution and a TA test will confirm this. However, if you add 1 g/L of Potassium Carbonate to a wine or must the reaction will vary from wine to wine and the pH will not shift in a linear, predictable fashion. This is why any attempt to adjust the pH should start with a bench trial! pH units are logarithmic; a pH of 3.0 is ten times more acidic than a pH of 4.0. So beware, a little shift goes a long way.
The effectiveness and amount of free SO2 needed to protect our wines is directly tied to wine pH: lower pHs require less free SO2, and higher pHs require more free SO2 to achieve the same amount of protection. Note: at pH 3.8 and higher, it is not chemically possible to maintain the amount of free SO2 in the wine that is technically required to protect it. So, if your wine has a high pH, then we highly recommend adjusting the pH down (using tartaric acid).
https://morewinemaking.com/articles/testing_wine_must
(Variation on: https://www.baderbrewing.com/content/ho ... ble-grapes)
16# Frozen grapes & 12# Canned grapes (from 2010)
3 tsp pectic enzyme
1/4 tsp potassium metabisulfate
2 tsp yeast nutrient
2 gallons artesian or spring water (heated to 130 degrees)
pH strip test 3.2 before adding water.
Let all ingredients sit for 2 hours. Strain/squeeze grapes and toss them.
Let sit covered for 24 hours.
NOTES ON PH...
Unlike TA testing and adjusting, pH adjustments are not linear; if you add 1 g/L of acid to a wine or must you now have exactly 1 more g/L of acid in solution and a TA test will confirm this. However, if you add 1 g/L of Potassium Carbonate to a wine or must the reaction will vary from wine to wine and the pH will not shift in a linear, predictable fashion. This is why any attempt to adjust the pH should start with a bench trial! pH units are logarithmic; a pH of 3.0 is ten times more acidic than a pH of 4.0. So beware, a little shift goes a long way.
The effectiveness and amount of free SO2 needed to protect our wines is directly tied to wine pH: lower pHs require less free SO2, and higher pHs require more free SO2 to achieve the same amount of protection. Note: at pH 3.8 and higher, it is not chemically possible to maintain the amount of free SO2 in the wine that is technically required to protect it. So, if your wine has a high pH, then we highly recommend adjusting the pH down (using tartaric acid).
https://morewinemaking.com/articles/testing_wine_must