Problem in the proportion of alcohol

[SonValley]

I am doing my making wine (white, red wine grapes) from 100% natural juice
Use yeast bread and directed by alcohol nearly 8%, recently used wine yeast but gave me only 7% alcohol,
Constant temperature 25 Celsius, I want alcohol nearly 12%?
Components and tools:
1 - gallon steel.
2 - 100% natural juice.
3 - wine yeast.
4 - white sugar.

 

[Kraffty]

I'm guessing you do not have a hydrometer but if you do you need to add more sugar and get an initial reading of 1.080 to start with. How are you coming up with your 7% alcohol figure?
Mike

 

[GreginND]

What was your starting and final gravity?
How do you know the wine was only 7%?
You need to use a wine yeast. Bread yeast is not the best to get the alcohol you want.

 

[SonValley]

Was measured the sugar device (Refractometer) measurement = 1085,
after 16 days of measurement = 1032:
(1083-1032) / 7.4 = 6.89%

 

[sour_grapes]

Was measured the sugar device (Refractometer) measurement = 1085,
after 16 days of measurement = 1032:
(1083-1032) / 7.4 = 6.89%

You cannot rely on that second measurement. A refractometer responds differently to a water/ethanol/sugar solution than a water/sugar solution.

 

[beggarsu]

Yeah, everyone says that it is inaccurate after fermentation


[ame]https://www.youtube.com/watch?v=Qd9uJ9JitJw[/ame]

However Northern Brewer here says they have some kind of calculation you can use with the measurement after fermentation.


http://www.northernbrewer.com/refractometer-calculator/

 

[cmason1957]

Yes, and if you use that calculator it says 10.7% abv.

 

[SonValley]

If hydrometer used in the measurement after fermentation?

 

[sour_grapes]

Well, then that gives you a direct reading of the specific gravity (SG). And studies over the past 400 years or so have nailed down the alcohol and sugar percentages that correspond to your initial SG and final SG.

 

[SonValley]

I measured the wine by Alheidromitr:
SG 1.001 / At 28 C° / Add 3 degrees SG=1.004 :
(1083-1004) / 7.4 = 10.67%
Is this true؟

 

[SonValley]

Yes, and if you use that calculator it says 10.7% abv.

How did you calculate the ratio of alcohol?

 

[JohnT]

Spend the money and get a hydrometer. It makes things much easier.

 

[sour_grapes]

I measured the wine by Alheidromitr:
SG 1.001 / At 28 C° / Add 3 degrees SG=1.004 :
(1083-1004) / 7.4 = 10.67%
Is this true؟

Yes, that sounds about right.

Spend the money and get a hydrometer. It makes things much easier.

It sounds like he has. And (Alheidromitr) sounds like he is in a part of the world where such a thing may be hard to come by,

 

[SonValley]

Yes, my friends, I'm tired so I got:
1-Wine yeast.
2-hydrometer.
3-Refractometer.
Thank you for helping me >>>

 

[cmason1957]

How did you calculate the ratio of alcohol?

I used the link in in the comment right above mine, for northern Brewer and put in the two SG readings from your refractometer-calculator. If spit out that answer. Refractometers can be used in the presence of alcohol, but you do have to correct the readings.