How is wine grape concentrate made?

Ask Dr Vinny

Hello there! I'm Dr. Vinifera, but you can call me Vinny. Ask me your toughest wine questions, from the fine points of etiquette to the science of winemaking. And don't worry, I'm no wine snob—you can also ask me those "dumb questions" you're too embarrased to ask your wine geek friends! I hope you find my answers educational, empowering and even amusing. And don't forget to check out my most asked questions and my full archives for all my Q&A classics.

Dear Dr. Vinny,

My son gave me a home winemaking kit, and it included a can of red grape concentrate, yeast pills and a 5-gallon container. How is grape concentrate made?

—Matt F., Daytona Beach, Fla.

Dear Matt,

Those home winemaking kits are a fun way to learn a little bit about winemaking. Of course, commercial winemakers use fresh grapes picked at just the right moment, but since that’s not possible in a kit, grape concentrate is used.

Grape concentrate is made essentially the same way any fruit concentrate is made—you’ve probably had orange juice made from concentrate at some point. To concentrate a fruit juice, the water is removed through a process of heating the juice and letting the water evaporate. Of course, heating juice might give it a cooked flavor, so concentrate is made under reduced pressure, which if you remember from science class, lowers the boiling point.

As much as two-thirds of the water is removed from grape juice during the concentrating process. I’m guessing that the instructions for your home winemaking kit instruct you to add water to the grape concentrate, which will hopefully give a good approximation of fresh grape juice.

Grape concentrate isn’t only used by home winemakers. Even commercial winemakers use a grape concentrate brand known as Mega Purple.

—Dr. Vinny

Winemaking Techniques Explained Ask Dr. Vinny

More In Dr. Vinny

Where do wine club wines come from?

Wine Spectator's expert Dr. Vinny explains where private label wines come from, and what …

Jan 25, 2021

What’s the difference between Brix, Baumé, Oechsle and residual sugar?

Wine Spectator's expert Dr. Vinny explains why measuring sugar content in grapes is so …

Jan 18, 2021

Will my wines get too cold in the garage?

Wine Spectator's expert Dr. Vinny covers the pitfalls of storing wine in the garage, …

Jan 11, 2021

Dr. Vinny's 25 Top Answers to 'What's the Difference Between …?'

Wine Spectator's expert Dr. Vinny offers disambiguations for wine topics far and wide.

Jan 4, 2021

Dr. Vinny's Most Interesting Questions of 2020

Wine Spectator's resident wine expert, Dr. Vinny, revisits the most thoughtful questions …

Dec 31, 2020

Dr. Vinny Answers Your Pandemic Questions (About Wine)

Wine Spectator's resident wine expert, Dr. Vinny, revisits all your questions about wine …

Dec 28, 2020