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A31 Tartan

Liquid Ale yeast from Imperial Yeast.

LabImperial Yeast· Ale · Liquid · A31

Specs

Attenuation
70–75%
The share of sugars the yeast ferments out. Higher attenuation means a drier, stronger beer.
Optimal temp
18–21°C
64–70°F
The range where this strain ferments cleanly, without throwing off-flavors. Most brewers pitch near the low end.
Flocculation
Medium
How readily the yeast clumps together and drops clear once fermentation winds down.
Alcohol tolerance
≈10% ABV
The rough ABV ceiling where the yeast stresses out and stops fermenting.

Genetic traits

Phenolics
POF−
Ferments clean
Phenolically clean (POF-negative). No clove or spice, so malt, esters, and hops come through unmasked. The norm for American and British ales and most lagers.
Diastatic
STA-1−
Not diastatic
Does not carry the STA1 (diastaticus) gene. It attenuates normally, with no diastaticus over-attenuation or gushing risk.

Same strain, other labs

Scottish Ale (1728)
A31 = 1728

Potential substitutes for A31 Tartan

Usually used in

Wee HeavyRed AleAmerican Brown AleCream AleAmerican Wheat BeerBlonde AleBlack IPARobust PorterAmerican StoutWinter Seasonal BeerAmerican BarleywineImperial StoutAmerican Strong AleWheatwine+19 more

Common questions

What is the A31 Tartan equivalent?
1728 Scottish Ale — the same strain from another lab, the Scottish Ale (1728) strain.
What is A31 Tartan's attenuation?
70–75% apparent attenuation.
What temperature should I ferment A31 Tartan at?
18–21°C is the recommended range.
What beer styles is A31 Tartan good for?
Wee Heavy, Red Ale, American Brown Ale, Cream Ale, American Wheat Beer, Blonde Ale, Black IPA, Robust Porter, American Stout, Winter Seasonal Beer, American Barleywine, Imperial Stout, American Strong Ale, Wheatwine, English Mild, Bitter, Extra Special Bitter, Pale Ale, Stout, Irish Dry, English IPA, Stout, Oatmeal, Stout, Tropical, British Strong Ale, English Barleywine, Old Ale, Stout, Foreign Extra, California Common, American Amber Ale, American IPA, Red IPA, American Pale Ale, and Imperial IPA & Altbier.
What can I substitute for A31 Tartan?
WLP028 Edinburgh/Scottish Ale Yeast and OYL-015 Scottish Ale.
Brew with A31 Tartan
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