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02-11-2019, 06:15
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The third beer in Whitbread’s Stout parti-gyle was Mackeson. Which may sound a little odd, it being a Milk Stout. But, on account of the particular way Whitbread brewed Mackeson, that wasn’t a problem.

Because the lactose wasn’t added in the copper, as you might expect, but at racking time in the form of primings. Meaning it was no problem to parti-gyle it with other beers. Before the addition of lactose, the rate of attenuation of Mackeson was very similar to that of London Stout, somewhere around 70%.

For something which today would be described as a Sweet Stout, this version of Mackeson is surprisingly robustly hopped. And, even after the addition of the lactose, the rate of attenuation isn’t that low – still over 60%. Far greater than the ridiculously under-attenuated Sweet Stouts to be found at the time in Scotland. Meaning the finished beer probably tasted bitter-sweet rather than just overpoweringly sweet.

Whitbread were already brewing large quantities of Mackeson before the war. It was a beer very much in vogue and, like Bass and Guinness, was also sold in other breweries’ tied houses. A sure sign of a beer that was a cut above the norm.




1940 Whitbread Mackeson Stout


pale malt
9.00 lb
70.98%


brown malt
1.00 lb
7.89%


chocolate malt
1.00 lb
7.89%


flaked oats
0.10 lb
0.79%


No. 3 invert sugar
0.50 lb
3.94%


lactose
0.75 lb
5.91%


caramel 1000 SRM
0.33 lb
2.60%


Fuggles 75 mins
1.50 oz



Goldings 30 mins
1.50 oz



OG
1056



FG
1021



ABV
4.63



Apparent attenuation
62.50%



IBU
32



SRM
42



Mash at
150º F



Sparge at
170º F



Boil time
75 minutes



pitching temp
62º F



Yeast
Wyeast 1099 Whitbread Ale





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