Monthly Archives: July 2007

Calibrating A pH Meter

pH meter, in a champagne glass about a quarter full of 6.86 buffered solution, reads a pH of 6.17 at 31.4 Celsius.To work properly, a pH meter must be calibrated. You do this by preparing (or buying) buffered solutions of known pH and testing the meter against them. My meter uses a two point calibration. It works by immersing the meter in the first buffer solution (pH 6.86 in this case) then reading the pH and temperature values.

You turn a calibration screw until the meter shows the correct pH for the given temperature (the bottle of buffer solution has a table of temperature and pH values). The pH of the “6.86” buffer solution that I’m using is 6.85 at 30 Celsius, the closest temperature on the correction table to 31.4, so I turned the calibration screw to 6.85. That’s the first “point” of the two point calibration process. The second step is exactly the same but with a different buffer solution (ph 4).

I’ll use my new toy – um, important scientific instrument – along with my simple acid titration kit to analyze my oregano wine. Fermentation has been very slow and I’m afraid the pH of the wine has fallen so low that it’s inhibiting the yeast.

I Bought A pH Meter

I’ve used pH papers for a while, but in making red wine from cherries I’ve gone beyond their limits. I can’t read the color very well when I’m measuring dark colored wine, and for the same reason, its tough to do acid titration with an indicator. Since I didn’t have a good way to measure it, I didn’t adjust the acidity of my cherry wine. Well it’s been fermenting away, but I didn’t solve that problem I just bought a little time. During that time, I ordered a cheap pH meter and I expect it to arrive today.

There’s an old saying that if you buy cheap, you buy twice. That probably applies here, but sometimes that’s not a bad thing. Buying cheap can be a good way to learn just what you need in a tool, and help you buy intelligently later on. I understand that replacement tips for high end pH meters cost about what my meter cost, so it might be smart to just buy a new cheap meter every time the old one breaks. I don’t know yet, but right now I can measure acidity a lot more accurately than in the past. That should mean better wine, and I’m excited about that!

Pruning Gold Nugget Tomatoes

I put a lot of thought into pruning my grapes, but I normally just let my tomatoes grow any which way they choose. I might try to tuck them into their cages every now and again, but I never thought about pruning. Now that I’m growing tomatoes for wine, I’m starting to wonder if some of the principles behind grape pruning would apply to tomatoes. If one leaf shades another on a grape vine, then I would want to pull one of those leaves because a leaf in the shade isn’t doing much in the way of photosynthesis. Wouldn’t that be just as true for tomatoes? Also, tomatoes have a way of sending branches off in every direction. Maybe trimming off the ones growing into the dirt would keep the fruit cleaner? Maybe it would reduce insect problems?


Pointing at a low branch that is sloping downward. This is the sort of pruning cut I'll be making.


In this photo, I’m about to prune a low branch that is sloping toward the ground. This is the sort of pruning cut I’ll be making this year. The tomatoes have grown taller and bushier since 6/21/07, when I took the above photo, but I’m going to start slowly with my pruning. If this goes well, I may try pruning tomatoes more like grape vines. I don’t know if I’ll really go that far, but if I do, I’ll get there by taking baby steps.

Cherry Mead Recipe

Country wine, second wine, and melomel

Cherry mead, often called “cherry melomel”, is usually made like a country wine. You make a country wine with small amount of fruit, 2-6 lb, per gallon of water (250-750 g/L) with enough sugar to bring the alcohol up to 12% and acid to balance. You would do something similar to make a conventional cherry mead, but use honey instead of sugar. Also fruit would be at the low end of the range. I’m not going to do that.

After pressing a conventional wine, the pressed fruit (called “pomace”) often has some color, flavor, and other “goodies” left in it. By adding water, sugar, and acid, you can make a light bodied enjoyable wine. That’s the way I’m going to make cherry mead.

How much honey? How much water?

The more water you use, the less impact the fruit will have. In deciding exactly how much, consider the amount of wine. You shouldn’t make more second wine than original wine, and maybe only half as much. Since I estimate three gallons of finished cherry wine, that leaves a 1.5-3 gallon range for my cherry mead. I decided on the high end of that range because fruit meads are often made with less fruit than comparable wines. The amount of honey depends on your alcohol target.

I’m aiming for a low alcohol (8-9% ABV) fruit mead, because I think this would suit a second wine better. If you prefer a higher alcohol content, then you could use more honey or less water. Using 2.5 gallons (9.5 liters) of water, for example, would raise the potential alcohol to 11% or so. In these calculations, I’m assuming no contribution from the pomace. There will probably be some sugar, though, so the actual amount of alcohol will be a little higher. To get more precise control over the alcohol, you could place the pomace in a clean bucket, mix up the other ingredients, then take a gravity reading. You could then nudge it up or down, to your target gravity, by adding honey or water. Such precise control wasn’t important to me, so I skipped that step.

Ingredients

Pomace from cherry wine
3 gallons (11 liters) water
6 lb (2.7 kg) honey
1 tsp tannin

Procedure

1) Place the pomace in a clean fermenter.

2) Heat one gallon of water to a boil, take off heat, and dissolve honey. Cool in a water bath.

3) Measure out another gallon of water. Use a little bit to dissolve the tannin and add it to the fermenter. Use some more to rinse out the honey container, to get the honey that didn’t pour out, and add it to the fermenter.

4) Add one gallon of water, plus any unused water from step 3, to the fermenter. At this point, you should have used three gallons of water including one gallon to dissolve the honey in step 2. The point here is to use three gallons (11 liters), so the exact amount in each step isn’t important. Just keep track.

4) Add the honey-water mixture to the fermenter when cooled (less than 100 Fahrenheit or 40 Celsius).

There’s plenty of yeast in the pomace, so no need to pitch any more. I noticed signs of fermentation the same day. The CO2 from fermentation will push the fruit to the top. This is called a cap, and you need to stir it in every day. If you’ve every heard a winemaker talk about “punching down the cap,” this is what he was talking about.

The cherry wine is still going, the cherry mead just got started, now it’s time to think about raspberries!

Cherry Wine Recipe: Pressed

I pressed the cherry wine last night. I got just under three gallons of free run, and another half gallon or so after pressing.


Free run cherry wine in a carboy. The wine is dark red with a layer of pink foam that comes just up to the '3' mark. These marks indicate gallons, and the one above it looks like a '1' but is actually '4' with some of the ink worn off.


The photo is from last night and shows the free run wine in a carboy. It’s foamy because I just poured it in through a funnel, and it’s still fermenting. You can see the foam comes up to the 3-gallon mark (the next mark is a “4” but looks like a “1” because some of the ink has worn off). Now that I’ve pressed, and the cherry wine is fermenting under an airlock, I’ll start on the cherry mead!

Still No Supply Squeeze From Colony Collapse Disorder

My cherry wine is fermenting nicely. I plan to press it soon, and use the pomace to make a cherry mead. The good price on the cherries worked out really well, but it did leave me with a dilemma about the honey. Use the wildflower that I have? It would be much better in the beer-like mead that I’m planning. Order more wildflower, so I can use it anyway? That would mean I couldn’t try something new. My brilliant plan was to pop over to Costco. They’re selling clover honey in 6 lb cartons for $7.99. That’s a little higher than I remember it from last year, but at $1.33/lb it’s still a good price. As an aside, it means that there’s no sign of a spike in honey prices as a result of Colony Collapse Disorder. The season isn’t over yet, of course, and we don’t really know how CCD will play out, but I wrote back in May that I didn’t expect a honey supply squeeze. With no new information out since then, I’m still an optimist.