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science question here about drop in proof

Posted: Mon May 14, 2018 9:59 pm
by jon1163
I've noticed it in every single one of my runs regardless of what I'm running, neutral, All Grain, sugar head, Etc, that my proof starts off in the first jar just a hair lower then my early heads then I get the typical drop-in proof over the duration of the run.

Here's a typical strip run example for me:
jar#-ABV
1-64
2-65
3-63
4-62
5-60
6-60
7-59
8-55
9-50
10-48
11-45
12-40
13-35
14-30
15-22
16-15

Why is the initial jar almost always a hair lower than my early heads?