Lecture #5 - Alfred's Clay Store - Alfred University

Souring• Secondary clays tend to contain moreorganic impurities than pure kaolins– Higher strength in many secondary clays is duein part to souring of plant matter (added duringsedimentation)• Soured moist clay is added to acceleratebacterial growth in new batches• Organics are often added to a clay beforemixing– Yogurt, milk, beer etc…– Be aware that souring smells bad; possiblehealth effects?