Wine Wizard
Cures To An Oversulfited Wine
FREESince you can’t measure your free and total SO₂, let’s do some numbers to see what kind of a potential problem you might be facing. First off, let’s talk about your bottle-rinsing
Advice For A Beginning Winemaker
MEMBERS ONLYWinemaking is always a learning process and even those of us that have been doing this for a long time still learn a lot every harvest and all year-round! However, that being said, I do have some tidbits for new winemakers. In my Winemaker’s Answer Book I spell out what I think are probably the
Remove A White Film on Carboy
MEMBERS ONLYWow, looks like you’ve got a serious case of “Ring Around the Carboy.” Thanks for sending in the picture, I always love it when readers do that because, especially in cases like these, it gives me a good visual to go from. I can see that pesky stain on the inside of the neck of
Steps To Preserve Your Oak Barrel
MEMBERS ONLYWell, the first thing I always say is, “A full barrel is a happy barrel.” That means that the barrel is best stored with wine in it! The acidity of the wine (generally reds tend to be a pH of 3.5–3.8-ish) keeps spoilage microbes at bay and of course the wetness of the wine keeps
Achieving Cold Stable Wines
MEMBERS ONLYFor those readers who are not familiar with the article referenced, I talk about how it was likely a reader’s malolactic fermentation would pick back up again when the weather warmed up again in the spring (he wanted to over-winter his wine undergoing MLF outside in order to help it get cold stable). It sounds
Rules Of Fining
MEMBERS ONLYIndeed, after using most fining agents there will be a layer of sediment generated and you’ll need to rack the wine off of it accordingly. Fining agents, by definition, are introduced into a wine to interact with whichever of the wine compounds you are trying to mitigate or reduce. For instance, bentonite is a natural
Topping My Wines Off
MEMBERS ONLYAs I explain in my book, The Winemaker’s Answer Book, oxygen can be a friend of wine (especially during active primary fermentation) but is more often its enemy. One of the biggest jobs of being a winemaker entails minimizing oxygen (air) contact in our aging wines by keeping our containers 100% full, or “topped up.”
Adding Carbonation To A Dessert Wine
MEMBERS ONLYIf you’ve got a carbonation setup at home that you use for your homebrew, cider, mead, or kombucha, you certainly can fizzy up some wine products for yourself. I like your idea of using a dessert wine, because the sugar in sweet wines can balance out the sensory “sharpness” of bubbles, possibly leading to a
Properly Adding Copper
FREEAh yes, the classic “I sunk a bunch of pennies in my carboy” tale. Forgetting for a moment that modern pennies contain very little copper, there’s a reason that most winemakers I
Properly Measuring Wine Cap Temperature
MEMBERS ONLYThat is a great question and I’m really glad you asked. Sometimes when those of us who have been making wines for quite some time write about some technique, process, or concept that we may think of as “simple,” we need to rethink for a moment that how we describe something might not be so
Protecting Your Wine From Oxygen During Racking
MEMBERS ONLYExcluding oxygen by gassing headspaces and purging containers is one of the most important winemaking jobs we have. Oxygen exposure during aging can create all sorts of problems from premature oxidation and loss of aroma to spoilage microbe growth. The tough part is just what you mention — how do we know, with our own
Trying to Work With Grape Juice That is Amiss
MEMBERS ONLYWell, your grape or juice source really put you in a bind. Those are some of the most unbalanced initial numbers I’ve ever seen, and I would seriously consider getting your juice from another source next year. Numbers like that — with the acid being so low and the Brix simultaneously being low may be,
Using Pectic Enzymes In A Red Wine
MEMBERS ONLYTo quote one of my vineyard colleagues who always likes to give multiple sides to every answer, “It depends” (thanks, Rich). And so it is with pectic enzymes in winemaking. Pectic enzymes are proteins that can be added to wines at different stages to achieve many different results: To increase juice yields at the press,
Crafting a Buttery-style of Chardonnay
MEMBERS ONLYIndeed, that flavor you’re after is primarily caused by the malolactic bacteria, which impart that buttery, dairy, or creamy taste in many Chardonnays. This is because these bacteria, depending on the strain, can produce a lot of a compound called diacetyl, which is a natural byproduct of their malic acid metabolism. Diacetyl really does smell
Malolactic Fermentation After Cold Stabilizing
MEMBERS ONLYI always think it’s wonderful when people can do a “natural” cold stabilization over the winter months. It’s an incredibly intuitive and very old-fashioned, non-interventionist way to accomplish a key winemaking task. It never gets cold enough here in Napa, California during the winter to really knock down any significant amount of our tartrate crystals
Adding Sorbate After MLF
MEMBERS ONLYWinemakers typically add sorbate (aka sorbic acid, often purchased as potassium sorbate) when they want to bottle a wine with a little residual sugar. It is often added right before backsweetening and bottling. Sorbate will inhibit the reproduction of yeast cells but it will not “kill” yeast, nor will it inhibit or kill bacteria. It
Volatile Acidity Fixes
MEMBERS ONLYA Sadly, blending VA levels downward remains the only option available for reducing VA content in small lots. Larger commercial wineries, with big lots and bigger pocketbooks, can afford the expense of reverse osmosis and distillation technology to remove it from their wines but there’s no affordable option for small producers. Simple filtration doesn’t work
Oxygen Ingression
MEMBERS ONLYDon’t worry, it’s happened to the best of us! If you can, check your pH and your VA (volatile acidity) to try to get a handle on whether or not this air intrusion caused any chemistry-altering damage to the wine. What I mean is, sometimes when we have an oxygen incursion it can mean an
Reducing Oak Flavor In Wine
MEMBERS ONLYI’m so pleased you’ve done some oak trials! If you’ve read my column over the years you know that I’m always advising our intrepid readers to do small-scale trials (sometimes I call them “bench trials” after the “lab bench” work surface of your average winery enologist) before they commit to an additive or course of
Is Oak Sanitation Necessary?
MEMBERS ONLYI never boil or rinse my chips because, you’re right, that’ll strip them of the valuable flavor and aroma right off the bat. The one thing you need to do first, either before you buy chips or before you add them to your wine batch, is to smell them. If they smell moldy, musty, or
Recommended First SO2 Addition
MEMBERS ONLYThanks, Bob, for joining fellow columnists and me for our first ever virtual WineMaker Harvest Boot Camp this past September! This question didn’t get answered in my Q&A session held at the end of my “Top 5 Harvest Mistakes to Avoid” talk (there were a number of others that didn’t get answered either that I’ll
Wine Bottle Deposits
MEMBERS ONLYI’ll assume you’re going to do red (not rosé) — that’s the easiest for small-volume winemaking. I’ll also assume you’ll hand-destem, so you really don’t need a de-stemmer. Just get out as many stems as you can by hand. You’ll need a good food-grade fermenter like a small, food-grade trashcan or a bin that you
Testing For Free SO2
MEMBERS ONLYGood for you for investing in a way to track your free SO2 (FSO2) levels. It’s one of the most important ways we can keep our wines safe. You can buy something like a Vinmetrica kit or send out samples monthly to a local wine analysis lab (like ETS here in Napa County), which is
Freezing Grapes
FREEGoodness, I’ve never answered two questions at the same time before! I decided to put the two of you together since your questions were so similar. There are some things that apply
Curing A Stuck Fermentation
FREEYes, sluggish and stuck fermentations are one of the most common, persistent, and frustrating issues that winemakers encounter. They happen for so many reasons, and possibly for a combination of so many