Each flint or obsidian flake is sharper than a scalpel !

• Protect your hands with heavy duty gloves if you manipulate big blocks

• Protect your eyes (and those of the ones watching you)

• Do NOT let children play or touche the flakes. Fully grind the edges of the flakes you may give to them

Flint dust can be dangerous for your lungs

• Flint dust is made of microscopic razors: knap in a well ventilated room.. or better: oustide.

Respect the prehistoric sites and archaeologists work

• Never knap on or next to a prehistoric site. Do not let your waste flakes in the nature.

• Do not throw a missed or broken tool. Do not burry it either.

• Take your waste flakes to a junkyard, put them in the appropriate container.

Identify your tools

• Use a diamond grinder to carve your signature (letter, symbol) so your work can be later identified as yours.. and as a modern replica, not a genuine tool.