Mangrove Jack's M03 NEWCASTLE DARK ALE A top fermenting ale yeast suitable for a variety of hearty British ales, promoting exceptional body and flavour. Ferments with full, rich dark fruit flavours. Suitable for dark mild ale, English brown ale, Scottish heavy ale and more Attenuation: Medium Flocculation: Medium Usage Directions: Sprinkle contents directly on up to 23 L (6 US Gal) of wort. For best results, ferment at 18-22 degrees C (64-72 degrees F).