![North of Kuruman on Twitter: "Did you know that bulbs not only help us to identify stones, but they can also tell us about HOW a tool was made? Hard hammer percussion ( North of Kuruman on Twitter: "Did you know that bulbs not only help us to identify stones, but they can also tell us about HOW a tool was made? Hard hammer percussion (](https://pbs.twimg.com/media/E3hk1wYUUAwbiAT.jpg)
North of Kuruman on Twitter: "Did you know that bulbs not only help us to identify stones, but they can also tell us about HOW a tool was made? Hard hammer percussion (
![PDF] Their lips are sealed: identifying hard stone, soft stone, and antler hammer direct percussion in Palaeolithic prismatic blade production | Semantic Scholar PDF] Their lips are sealed: identifying hard stone, soft stone, and antler hammer direct percussion in Palaeolithic prismatic blade production | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/c38099131859817ef9a441d02d756dcf579b8fec/3-Table2-1.png)
PDF] Their lips are sealed: identifying hard stone, soft stone, and antler hammer direct percussion in Palaeolithic prismatic blade production | Semantic Scholar
![Blades produced via hard hammer direct freehand percussion with core... | Download Scientific Diagram Blades produced via hard hammer direct freehand percussion with core... | Download Scientific Diagram](https://www.researchgate.net/profile/Anthony-Boldurian/publication/238448935/figure/fig3/AS:669046991241248@1536524641933/Blades-produced-via-hard-hammer-direct-freehand-percussion-with-core-hand-gripped-firmly.png)
Blades produced via hard hammer direct freehand percussion with core... | Download Scientific Diagram
![Jastrzębia Góra 4: example of direct percussion with both hard and soft... | Download Scientific Diagram Jastrzębia Góra 4: example of direct percussion with both hard and soft... | Download Scientific Diagram](https://www.researchgate.net/profile/Dominik-Plaza-2/publication/261008679/figure/fig5/AS:392387009499140@1470563761208/Jastrzebia-Gora-4-example-of-direct-percussion-with-both-hard-and-soft-hammer-on-soft.png)