Juice to Better Wine: Tricks & Pitfalls By kourofskywine on June 7, 2026

Working with grape juice is often considered a first step in the winemaking ladder: kit to juice to grapes. A generally shared winemaking belief is that working with whole grapes is the goal and that one never goes “backward.” It’s just-not-the-done-thing!

I used to believe that working with juice was okay if you were purchasing fresh juice for white wines that were not “aromatic,” such as for Chardonnay but probably not Gewurztraminer, where grape-skin contact was helpful in expressing aromas and flavors. In my view juice did not make good red wines. And reconstituted grape juice was right out! Until, that is, I had a little problem that needed fixing. Wow, did my world view change.  

It happened one year when I decided to make some wine from the grapes of an Italian varietal grown in California, called Dolcetto. For whatever reason, I mismanaged my oak addition and found I had wildly over-oaked it. This amount of oak wasn’t going to fade away with aging. Fining agents don’t work especially well for removing excess oak from a wine. Best practice is to add unoaked wine to balance out the flavor and aroma. It just so happened that I received an email from my wine club offering Chilean juice. Fate was calling to me. I ordered some Carménère as reconstituted juice, as it’s similar in style to Dolcetto.

I was successful in blending out the oak in my Dolcetto and the final wine was quite nice. But I had three gallons of pure Carménère left over, which I bottled and promptly forgot about. A few years later I stumbled upon it and thought I should try it. What a surprise to find it had developed into a very smooth, enjoyable wine similar to Pinot Noir. I never thought that such enjoyable wine could come from reconstituted juice. Though I still feel that wine from grapes makes a better wine, I have continued to work with Chilean juice. It fills certain niches in my cellar.

But this type of juice presents its own challenges and can be problematic if not approached with care. This article will discuss how I approach making better wine from juice.

Types of Juice

Wine juice is generally obtained only from pressed grapes, with the skins removed. Sometimes the skins may be dried and sold with the dried skins as an additive. Though any commercial wine, labeled as wine, can only legally be from grape juice. Juice is not wine and is considered “food.” In the US, we have strong food labeling laws and juice that is intended for wine is labeled as “grape juice.” Thus, you can be relatively sure that if so labeled, it is indeed, juice from grapes. But which grapes? This is where the strict wine labeling laws and food labeling laws diverge. So, buyer beware!

Like any business, juice producers want your business and most are reputable dealers. Thus, a bulk buy through a reputable wine juice business or through a winemaking club is a best bet.

Juice is a generic term. There are different types of juice: kit, fresh juice and reconstituted. All three types of “free juice” remove the burden (and expense) of crushing the grapes and pressing-off the skins. That task requires a crusher/de-stemmer, which not only crushes the grape berries but also separates them from the stems. It also requires a good wine press that presses off the juice from white varietals or separates the red skins from the wine.

Kit wines, as the name suggests, come complete with instructions and all needed ingredients, such as yeast. The juice is concentrated, but fully balanced, if properly reconstituted, for the user. As such, they are expensive and don’t allow for many winemaking choices. They can, however, provide a winemaker with something reasonably affordable that they can’t easily get in a smaller, more manageable size. For example, it’s difficult to find, readily available, late harvest Riesling or Pinot Noir from Oregon. You can as a kit. An experienced winemaker can use the basic juice to make a wine in the style that you prefer.

Fresh juice is a pleasure to work with. This is juice that comes directly from the grower’s vineyard, allowing you to know its source and how it was grown. White wines work best for this, but many red wine juices are sold as well. Fresh juice is usually not adjusted, but most are treated with sulfur to stabilize them. They are settled-out for you. Settling is when pure juice is separated from the bits of grape skins or seeds that occur during pressing. Fermenting wine on these “gross lees” can cause stinky wine.  This step saves you the work pressing and separating out the gross lees, and the loss of fair amount of juice trapped in that sediment.

Fresh juice is not balanced. The winemaker must determine and adjust the sugar and acid levels, though many times the grower will share these figures. The winemaker has much more control over the style of the wine. The down side of fresh juice is that it is mostly local varietals that can be grown in your region. If shipped from another region, it becomes very expensive, unless purchased in bulk by a business or wine club.

Reconstituted juice is like fresh juice in that it is settled out, but it is concentrated under vacuum, for less expensive shipping. Water is very heavy which is why shipping fresh juice is difficult and expensive. The juice concentrate is then re-constituted at the point of sale. Reconstituting the juice is adding water, usually pegging the sugar levels to the original brix. Or so! The levels are often reconstituted to 20 to 22 brix, but can vary.  Usually in reconstituted juice, acids are not adjusted. So, the winemaker must determine the basic levels of sugar and acid, including titratable acidity (TA). Skins are not usually provided, a detriment to using any red juice, as color, aroma and flavor come from the skins.

A big factor in reconstituted juice’s favor is that it is cheap. Wildly cheap! Two factors for this are the US dollar which is usually strong against a 2^nd world country, such as Chile, and the much lower shipping costs of concentrate.

The Fun of Working with Reconstituted Juice

Why work with reconstituted juice? Freedom. The price is right. It fills a void. It can work as a corrective. And it can make good wine for a good price.

Because it costs less, there’s less to lose by experimenting with reconstituted juice, sometimes hailing from Chili, Argentina or, less often, from Europe. Grapes shipped from California or Oregon are expensive to buy and expensive to ship. So, when I work with whole grapes, I’m careful, and tend not to experiment. I feel freer to experiment, say with an unusual blend, with Chilian juice. And if I like how I’ve made the Chilean wine, I can replicate it with whole grapes.

It also can fill a hole in your cellar. My household likes Pinot Noir. So, I make a lot of Pinot from just about every source. Also, wine from juice tends to come around a little more quickly than wine from whole grapes. Have you every enjoyed the last bottle of a vintage only to discover that it had just reached the perfect maturity? Juice does need time to settle in, but it can deliver a nice quaff within a year while your dream vintage ages.

Spreading out the number of wines you make in a year (over two seasons), allows you to focus your attention more fully on each vintage. You have more time to consider each of the wine you are currently fermenting in more depth, planning your next moves without rushing. Life can get very complicated when you are chaptalizing one varietal, reducing sugar in another, acidifying a third while calculating an acid addition to a fourth.  

Wine from juice can, perhaps, deliver a solution to a problem i.e. helping you out of a spot, like my oak-plank wine. It can add a “lift” to a one-dimensional wine. Even before bottling, a flat wine reveals how mundane it is. Blending is often the answer. Why wait for a new vintage from the northern hemisphere? Or maybe you’ve made too much or too little wine and need some additional wine to work out a good storage plan.

And maybe your life is not as sweet if you don’t have the yeasty smell of fermenting wine greeting you in the morning and reminding you of la dolce vita.

The Special Problems of Reconstituted Juice

As a part of the task of making any wine, a winemaker must focus on the potential wine’s balance, including alcohol, acid, tannin and sugar, and the wine’s complexity, the layers of aroma and flavor. These both comprise the wine’s texture, the full expression of balance and complexity: How is it on the palate?

This is true when working with grapes and when working with grape juice. Reconstituted juice has special issues with texture, especially red wine as there are no skins to add extra flavor, aroma and texture.

The two sides of texture are balance and complexity. A common problem with wine made from reconstituted juice is that the juice often lacks a feeling of weight in the mouth and can lack a smooth finish. But the biggest elephant in the room is a lingering hint of sweetness after fermentation is complete. I have noticed some warm climate wines have that finish as well. But rather than from a long “hang time,” this sweetness may be from the process of concentration.

Grape juice has a combination of sugars, which are fructose and glucose, generally in equal amounts.  When we add sugar to our juice, we are probably adding sucrose. On a sweetness scale, one gram of sucrose will tase sweeter than one gram of glucose, but the same amount of fructose will taste from 105 to 125% sweeter than sucrose and 130 to 150% sweeter than glucose.

Does reducing and then reconstituting juice lead to changes in the percentages of sugars? I can find no definitive proof of this, but to my palate, wine made from reconstituted juice has a slight sweetness at the finish and will need careful balancing. For that balancing, acid can be your friend. Not only does sweetness balance high acidity, acidity can help balance sweetness.

A second problem of sweetness can arise from an incomplete fermentation. I find that any juice, whether reconstituted or chaptalized, tends to struggle at the end of fermentation. With reconstituted juice, I find fermentation often stops at about two (2) brix. Although this sugar will give a pleasant weight to the wine on the palate, it can, and usually does, fizz in the bottle. (Oops!)

A noticeable problem of reconstituted juice is color and weight. These grapes may have limited soaking prior to being crushed and pressed. Juice from thick-skinned red varietals might be less of a problem. But when working with lighter-skinned red varietals, this may produce a balance and texture problem in the finished wine.

Change a Weakness to a Strength: The Wonderful Lightness of Being

Not all red wines need to be fruit bombs. Pinot Noir is a perfect example. So too are Gamay wines, Dolcetto, and Grenache. The appeal is a lovely lightness on the palate, with just enough tannin to carry the flavor and with, perhaps, a touch more acid than a Cabernet or even Merlot. The juice versions of these varietals may be exactly that, elegant rather than block buster. Some winemakers use a process called carbonic maceration or a whole cluster fermentation to achieve this result. In a way reconstitution may provide a similar wine.

Carménère, a Bordeaux grape widely grown in Chile, is known to have velvety tannins. In juice form its tannins are light but smooth. As I mentioned above, my accidental Carménère aged into a wine akin to Pinot Noir. When I made Carménère from juice a second time, I decided to do a very light fining. This made a new wine softer and more like a Pinot Noir. I used a weakness to my advantage. Like they say, if you are given lemons, make lemonade.

Putting This All Together

One begins a juice fermentation like any other. I usually start with measuring the sugar in the juice. You must know this number before fermentation begins to know the final alcohol in the finished wine. The number is usually from 20 to 22 brix. Adjusting is a simple task.

Next, I measure the acid levels. You may want to derive the TA, (titratable acidity) which is also called the total acid. It’s the general neighborhood of the acid level. The address is the PH, which is the total hydrogen ions in the juice. I like to do major adjustments before fermentation, as the fermentation process integrates the acid addition or reduction. For reconstituted juice, I like to keep the PH 0.10 to 0.15 below the PH I normally like this measurement to be. I can fine tune, either up or down, after fermentation is complete. This gives me latitude to balance and mask any perceived sweetness using the acid levels in the wine.  

If I am working with a red wine, I will usually add oenological tannin to hold the color and to give the wine good texture on the palate. I usually add about 1/8^th of a tsp per gallon. This is supplemented with oak aging.

I recommend yeast that is a strong fermenter for reasons discussed above, namely sugars that might be difficult for yeast to untangle. Like us, yeasts will probably do the easy job first, leaving the hard work for later. The yeast must be strong enough to finish up. Also, make sure to add proper nutrients to keep the fermentation going, and going cleanly.  

Normally I co-inoculate my sugar fermentation with a malic acid fermentation. I no longer do that with reconstituted juice as I am concerned that this procedure may be a further burden on the yeast already struggling to finishing the sugar fermentation. Any desired malolactic fermentation can be performed after sugar fermentation ceases.

I am now trying to forgo a malolactic fermentation by using the yeast 71B, which naturally reduces malic acid as part of the sugar fermentation. We’ll see whether this process will reduce the malic acid enough as red wines need more malic acid reduction to balance with the tannins on the palate. On the white side, I like my whites zippy, so that’s less of a problem for me.

I recommend vigorous stirring during fermentation, in an open container, to insure a well oxygenated, clean fermentation. Splash racks can also be used, though I feel that the aromas and flavors are best enhanced by the stirring process.  

When the sugar fermentation is reaching its end point, at about the last 3-4 Brix, I add ½ to 1 Tsp of DAP for 5 – 6 gallons. DAP is pure nitrogen and like a mountaineer’s candy bar, I believe it helps the yeast climb that last peak. I feel that the yeast is stopping as it’s grown tired and nutrient deficient as it attacks the more complex sugars.

I recommend you always carefully check that fermentation is complete by using a hydrometer. The calibrated glass tube must sink the bottom of the test tube showing .990. Remember, reconstituted juice is a trickster! 

After any ML fermentation, and any fining, filtering and oaking, consider your final PH. If you’ve kept your PH lower than normal for that wine, let your taste buds tell you if the wine is too acidic or whether the current acid level balances any perceived sweetness in the wine. You should use only tartaric, not citric to raise the acid level, to avoid any ML interactions. Use only potassium carbonate to reduce acidity, as calcium carbonate may linger in a finished wine. And go very slowly, adding any calculated addition in tranches. Results often don’t seem to match your calculations and you can avoid “over-doing.”

Final Thoughts

All winemaking has challenges. The purpose of the winemaker is to recognize the components of juice, and of the resulting wine, to either guide the wine to the fullest extent of the grape’s terroir, or to craft that wine into the best possible expression of that varietal’s potential. In this task, working with juice is no different than working with clusters of grapes. There may be a few more challenges with working with reconstituted juice, but solving challenges is what we do as winemakers.