New Giveaway - Wort Monster Conical Fermenter!

Home Brew Forums > Home Brewing Beer > General Beer Discussion > True ABV with Lactose




Reply
 
LinkBack Thread Tools Display Modes
Old 06-13-2012, 09:19 PM   #1
Heatwaves
Feedback Score: 0 reviews
Recipes 
 
Join Date: May 2012
Location: Santa Ana, CA
Posts: 33
Likes Given: 1

Default True ABV with Lactose

I added 1 lb of Lactose to a 5 gallon batch of Porter. I'd read that this would account for up to 0.007 of additional gravity.

When calculating the true ABV, should I subtract 0.007 from the actual hydrometer reading?

For example, if my OG hydrometer reading was 1.067 and my FG is 1.029 would by true ABV be...

5.1% to represent 1.067 (OG) and 1.029 (FG)

or

6.0% to represent 1.067 (OG) and 1.022 (FG) [1.029 - 0.007 lactose corrected]?



__________________
Heatwaves is offline
 
Reply With Quote Quick reply to this message
Old 06-13-2012, 09:26 PM   #2
Raenon
Feedback Score: 1 reviews
Recipes 
 
Join Date: Jan 2012
Location: York, PA
Posts: 425
Liked 52 Times on 29 Posts
Likes Given: 3

Default

If you measured the OG with the lactose in it, you need to subtract the 0.007 from the OG as well as the FG if you wish, but 1.060 OG -> 1.022 FG is still 5.1% ABV

It doesn't matter how many points you're left with, it matters how many fermented. In this case, you have 38 gravity points that fermented out, which will be 5.1% ABV. Even if you started with a 1.138 and only fermented to 1.100 (by some strange use of nonfermentables), it'd be 5.1% ABV.

__________________
Raenon is offline
 
Reply With Quote Quick reply to this message
Old 06-13-2012, 10:29 PM   #3
Heatwaves
Feedback Score: 0 reviews
Recipes 
 
Join Date: May 2012
Location: Santa Ana, CA
Posts: 33
Likes Given: 1

Default

Thanks! Appreciate the info.

__________________
Heatwaves is offline
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Lactose and Carbonation Hastur General Beer Discussion 5 10-31-2011 11:56 PM
When do I add Lactose? jonbomb General Beer Discussion 3 01-11-2011 08:05 PM
How Sweet is lactose? johnd4 General Beer Discussion 1 11-09-2009 09:17 PM
Lactose Tsuyako General Beer Discussion 10 05-07-2009 06:26 PM
Using lactose and maltodextrine emacgee General Beer Discussion 2 12-18-2008 03:17 AM



Newest Threads