The Helwan retouch was a bifacial microlithic flint-tool fabrication technology characteristic of the Early Natufian culture in the Levant, a region in the Eastern Mediterranean (12,500 BP – 11,000 BP) such as the Harifian culture.
[1]: 172–3 The decline of the Helwan Retouch was largely replaced by the "backing" technique and coincided with the emergence of microburin methods, which involved snapping bladelets on an anvil.
[2][1]: 172–3 Natufian lithic technology throughout the usage of the Helwan Retouch was dominated by lunate-shaped lithics, such as picks and axes[1]: 167 and especially sickles (which were predominantly—at least 80% of the time—used for harvesting wild cereals).
[3]