Wednesday, 30 November 2022

Let's Brew Wednesday - 1910 Truman Keeping Imperial Stout

The question which immediately springs to my min is: “If this is the Keeping Imperial Stout, is the other one a Runner?”

Looking at the numbers, the answer could well be “yes”. The hopping rate is much higher: 10.1lbs per quarter (336 lbs) of malt compared to 5.6 lbs. That looks like the difference between a Runner and a Keeper. The OG here is a bit higher, too.

A classic London grist of pale, brown and black malt was employed. (Some of the pale being made from Chilean barley.) Along with some sugar of a not clearly specified type. “Fowler P.”. Fowler was a manufacturer of invert so No. 3 isn’t such a crazy guess. Still loads of other things it could have been.

The FG is a total guess. Something this strong would usually have been aged for at least 2 years. Depending on how active the Brettanomyces was, that could have left the FG surprisingly low.

Most of the hops were Kent from the 1908 and 1909 crops, the former cold stored, as well as some Oregon from 1908.

1910 Truman Keeping Imperial Stout
pale malt 15.50 lb 71.26%
brown malt 1.75 lb 8.05%
black malt 2.00 lb 9.20%
No. 3 invert sugar 2.00 lb 9.20%
caramel 500 SRM 0.50 lb 2.30%
Cluster 120 mins 2.00 oz
Fuggles 120 mins 1.50 oz
Fuggles 60 mins 3.50 oz
Fuggles 30 mins 3.50 oz
Goldings dry hops 1.50 oz
OG 1100
FG 1028
ABV 9.53
Apparent attenuation 72.00%
IBU 87
SRM 61
Mash at 157º F
Sparge at 175º F
Boil time 120 minutes
pitching temp 61º F
Yeast Wyeast 1099 Whitbread Ale


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