Dark Materials – Murphy & Son Dried Yeast

Dark Materials – Murphy & Son Dried Brewing Yeast

Dark Materials is a highly versatile dried brewing yeast developed for brewers seeking both reliability and flavour flexibility. Capable of producing clean and crisp beer profiles similar to a traditional Kölsch, this yeast truly shines when used in dark beer styles, helping create rich, full-bodied and characterful stouts and porters.

Its temperature-responsive fermentation profile allows brewers to fine tune ester production and create beers ranging from exceptionally clean and neutral to subtly fruity and complex. By adjusting fermentation temperature, Dark Materials can enhance dark malt flavours while contributing notes of plum, raisin and stone fruit that complement roasted grain character.

Why Choose Dark Materials?

• Highly versatile dried yeast suitable for multiple beer styles
• Excellent choice for stout, porter and imperial stout production
• Clean, crisp fermentation character
• Subtle fruity esters with temperature control
• Fast fermentation performance
• Medium flocculation for efficient yeast management
• Attenuation range of 76-82%
• Suitable for high gravity and high ABV beers
• Direct pitch or rehydration options available

Ideal Beer Styles

Dark Materials is suitable for a broad range of commercial and craft brewing applications, including:

• Stout
• Porter
• Imperial Stout
• Kölsch
• English Mild
• Brown Ale
• Amber Ale
• Blonde Ale
• American Wheat
• Pale Ale
• IPA
• California Common
• Barley Wine

Fermentation Performance

Fermentation temperature has a significant influence on the final beer profile. At lower temperatures, Dark Materials produces a cleaner fermentation character with restrained fruitiness. Higher fermentation temperatures encourage more expressive ester development, bringing forward subtle apple and fruit notes while maintaining balance and drinkability.

Recommended fermentation temperature: 16-22°C
Attenuation: 76-82%
Flocculation: Medium
Pitching rate: 50-100g/hL
Alcohol tolerance: Typically around 10% ABV and capable of higher ABV fermentations with appropriate pitching rates and nutrition.

Pack Size & Storage

Dark Materials is supplied in a convenient 500g pack suitable for commercial brewery use.

Store dry at 4-10°C
Shelf life of 36 months when stored correctly
Opened packs should be resealed and used within 5 days

Whether you’re brewing a crisp Kölsch, a rich porter or a robust imperial stout, Dark Materials delivers the fermentation performance, consistency and flavour control modern brewers need.