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Offline johnnyapplepie  
#1 Posted : Friday, August 17, 2012 8:03:58 AM(UTC)
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"Now that I have a specific gravity meter along with a hydrometer. what should the SG reading be on a mash that has completed fermentation?
Does it matter if it's a sugar wash or a corn wash?
just curious. I'm going to do a little research on this little handy tool."
Offline John Barleycorn  
#2 Posted : Friday, August 17, 2012 8:52:50 AM(UTC)
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Originally Posted by: johnnyapplepie Go to Quoted Post
what should the SG reading be on a mash that has completed fermentation?
Does it matter if it's a sugar wash or a corn wash?
For a sugar wash, somewhere south of 1.000. My Birdwatcher's washes usually finish at 0.992 (from OG of 1.080) ... they're pretty consistent.

But in general it's going to depend on a lot of factors (OG, grain bill, adjuncts, additives, yeast, etc. etc.). If you're actually mashing (rather than just adding some grains for flavor) you can end up with some stuff that won't ferment (much like the stuff you add just for flavor doesn't actually ferment). You can take a look at a few beer recipes -- many of them are expected to finish above 1.000.

--JB
Offline scotty  
#3 Posted : Friday, August 17, 2012 9:18:56 AM(UTC)
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Ill go double on that JB.

That above 1 finish for beer has me fascinated because it makes me think that a whiskey mash that is stabilized slightly above 1 might have more flavor.

OR is it just the non fermentables left in a whiskey mash that give it the flavor and therefore must be fermented to below 1 ?????????

QUIEN SABE
Offline John Barleycorn  
#4 Posted : Friday, August 17, 2012 2:42:32 PM(UTC)
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"
Originally Posted by: scotty Go to Quoted Post
it makes me think that a whiskey mash that is stabilized slightly above 1 might have more flavor.

OR is it just the non fermentables left in a whiskey mash that give it the flavor and therefore must be fermented to below 1 ?????????
From what I've read, it's both.

The yeast we select has a particular flavor profile. A quick skim through the wine yeast offerings shows us as much. Some produce more esters for those fruity notes, others are listed as neutral and a few talk about fusel production. So when it ferments sugar, that particular strain generates it's own unique combination of ethanol and congeners given similar conditions. After getting only a few runs under our belts, we quickly understand what that means. I found my first whiff of strong tails at the end of my very first stripping run to be a very unpleasant experience ... to me it's an absolutely disgusting smell.

The stuff that doesn't ferment (non-fermenting sugars and other stuff), well that contributes some flavors to the wash too. So to my understanding, anything that comes across other than the pure ethanol and pure H2O (congeners, carryovers due to water chemistry, etc.) must affect the flavor of the distillate to some degree ... provided it reaches that magical detection threshold I see mentioned in a bunch of papers. Serious rum drinkers seem to be born with this understanding.:)

My biggest issue is getting enough experience to figure out how to get the reins on some of this stuff so I can begin to get some control over the flavors I want. Unfortunately, I'm an awfully long way from that point. On the flip side, there's an awful lot of things to tinker with along way ... so boredom is a long way off as well.:)

--JB"
Offline muadib2001  
#5 Posted : Friday, August 17, 2012 3:08:54 PM(UTC)
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JB,

Hear Hear!
Offline scotty  
#6 Posted : Friday, August 17, 2012 10:06:06 PM(UTC)
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"My biggest issue is getting enough experience to figure out how to get the reins on some of this stuff so I can begin to get some control over the flavors I want. Unfortunately, I'm an awfully long way from that point. On the flip side, there's an awful lot of things to tinker with along way ... so boredom is a long way off as well."

John because we need to getting a handle on making our products i have decided to limit my distilling to vodka. Moonshine (corn & rye) and irish whiskey. I will forget about rum and other products for the sake of getting better at producing just a few diferent types.
Offline heeler  
#7 Posted : Saturday, August 18, 2012 11:41:51 PM(UTC)
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"hmmmmmm steeped not boiled huuhh,hmmmm, pot in a pot sounds very similar to BIAB (brew in a bag) where you add your grain bill to the bag and STEEP to extract the sugars from the grains and rinse or sparge the grains with more hot water.
Most grains for distilling are cracked not ground to a flour - its just tooo hard to work with and not absolutely necessary, but grind if you must. The mill I have will not grind to a flour but I've never found the need to get it that fine. But a very interesting veiw indeed."
Offline FurFishNGame  
#8 Posted : Monday, August 20, 2012 4:53:12 AM(UTC)
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Do I take SG measurements before or after pitching yeast? Also, is the Sg accurate when all tge dead yeast and sugar is settled on the bottom ir do I have to stir it up?
Offline muadib2001  
#9 Posted : Monday, August 20, 2012 5:09:39 AM(UTC)
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Take your beginning SG before you pitch the yeast.

Take a ending SG after all yeast activity has ceased and settled out.

(Beginning SG less Ending SG) times 129 will give you an approximate percent ABV.
Offline Bushy  
#10 Posted : Monday, August 20, 2012 5:26:22 AM(UTC)
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"
Originally Posted by: heeler Go to Quoted Post
hmmmmmm steeped not boiled huuhh,hmmmm, pot in a pot sounds very similar to BIAB (brew in a bag) where you add your grain bill to the bag and STEEP to extract the sugars from the grains and rinse or sparge the grains with more hot water.
Most grains for distilling are cracked not ground to a flour - its just tooo hard to work with and not absolutely necessary, but grind if you must. The mill I have will not grind to a flour but I've never found the need to get it that fine. But a very interesting veiw indeed.


Hi Heeler, your right the grains are sprouted then cracked, not ground. When cooking they are brought up to temp between 150 and 155 then held there for about an hour or so. Sparging is done with boiling water poured over the grain that has been removed from the pot. Thats why you use a grain bag, or if you have a mash tun you drain the liquid from the tun into the boil pot and the grain is retained by the seperator, then sparge."
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