Imperial Yeast | A10 Darkness Ale | Double Pitch

Imperial Yeast | A10 Darkness Ale | Double Pitch

$12.99
Imperial Yeast A10 Darkness Ale enhances roasted and caramel malt character while supporting high-gravity fermentation. A powerful strain built for bold, malt-forward beers.
  • Designed for stouts, porters & barleywines.
  • Accentuates roasted & caramel malt flavors.
  • High alcohol tolerance for big beers.
  • 200 billion cells, designed for 5 gallon batches
Ice pack:

Ice Packs / Shipping: For best results, we strongly recommend adding an ice pack to your liquid yeast order. Ice packs do not guarantee that the yeast will arrive cold, but will keep yeast colder for longer during transit. We can not replace yeast that arrives warm. In warm weather months, we highly encourage choosing dry yeast.

Storage: Store in the fridge (33–38ºF). Do not freeze. Pitch cold - do not warm to room temp prior to pitching. Use within 4 months for direct pitching. For pouches older than 4 months, or that are warm, use a yeast starter to boost cell count.

Fermentation Temp Range
Each yeast strain has a temperature range where it performs best. Lagers require cooler temps, while Kveik yeasts can ferment in extreme heat. Maintaining the proper fermentation temperature for each yeast strain is crucial its health. Matching a yeast's ideal range to your environment (or your ability to control temp) is key to getting clean, consistent results.
Scale from 30°-120°F
Product Analysis
This typical analysis is not to be construed as product specification. Typical analysis represents average values, not to be considered as guarantees, expressed or implied, nor as a condition of sale.

Yeast Format, Liquid
Yeast Style, Ale
Flocculation, Medium
Attenuation, 71~75%
Haze, Medium
POF, Negative
Diastatic, Negative
Fermentation Temperature Range, 62~72ºF
Alcohol Tolerance, 12%

A10 Darkness Ale is formulated specifically for dark and high-gravity beer styles. This strain enhances roasted barley, chocolate malt, and caramel notes while maintaining balance and drinkability in strong ales.

With attenuation between 71–75% and alcohol tolerance up to 12%, Darkness handles big beers with confidence. Medium flocculation supports structure and body while allowing layered malt complexity to shine. Ferments cleanly between 62–72°F.

A10 Darkness performs best in rich, malt-driven styles where depth and alcohol tolerance are essential.

Ideal for:

• Irish Dry Stout
• American Stout
• Porter
• Barleywine
• Imperial Stout

• Store refrigerated at 33–38°F
• Do not freeze
• Pitch cold directly into oxygenated wort
• Ferment between 62–72°F for best performance
• Use within 4 months for direct pitching
• For older or warm pouches, use a yeast starter

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Imperial Yeast | A10 Darkness Ale | Double Pitch
From $12.99

Frequently Asked Questions

Yes. While designed for bigger beers, A10 performs reliably in standard fermentation setups when proper temperature control is maintained.

Yes. Each pouch contains 200 billion cells, designed for direct pitching into most standard 5-gallon batches.

A starter is recommended for high-gravity beers to ensure adequate cell growth and healthy fermentation.

For best results, ferment between 62–72°F to preserve malt depth while maintaining a clean finish.


A10 produces medium haze and moderate flocculation, appropriate for dark ales where clarity is not the primary focus.

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