A Question About Gonjos

[Alam Shah]

Originally Posted by BluErf

I thought of another explanation - when a keris sheath is made for a keris, a well-made sheath's only point of contact with the keris shd be the ganja. Hence, the blade is 'suspended' in the sheath, supported only by the ganja. With time, and with all the wearing of the keris (worn upright), the weight of the blade causes the ganja to warp away from the main blade.

Agreed with BluErf comment, adding another...
In Javanese terms, this phenomenon is known as "Nyangkem Kodok". This might be due to age wear from years of ritual cleansing or improper treatment of the blade. Uneven heat treatment to one part of the blade was also thought to contribute to this effect.