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Tempering gives hardness to the knife to ensure a long lasting cutting edge. Its a very important operation.
The knives are carefully placed in special trays. They are put into the furnace at 820° centigrade.
After a period at these high temperatures, the knives are immediately placed into oil.
The knives are then put back into the furnace to "return" hardness to the steel (200°-300° C).
For the Carbon Knives, we verify their straightless, one by one.
It's not really a defect. We make every effort to have straight blades, but we can not do anything to go against the memory of steel.