JR asked:
From which material and how is Kankantum made?
JR, Haifa/Israel
The Kollel replies:
Here is what we have on this in our Background to the Daf.
KANKANTUM - (O.F. adrement) vitriol, black ink used by shoemakers.
If you have any further questions, please contact us.
Be well,
Kollel Iyun Hadaf