I received this question via email. I am not really a klaf expert, I was wondering if anyone could answer this question: Dear Rabbi Gutnick, I am writing to you because a good friend of mine has put the idea into my head that the klaf in my tefillin were not really tanned and therefore are not kosher. He referred me to Megilla 19a re diftera. From the research that I have done so far, it seems that the klaf that is used today is tanned only with a lime wash. On all of the tanning websites I’ve seen so far, they say that the lime doesn’t accomplish tanning but only the removal of the hair and some other pre-tanning effects. Would you be able to explain to me or refer me to a website that explains how the tanning process that is used today takes the hide out of the category of diftera? Thank you very much.
David, good question.
ReplyDeleteThe safest, least invasive way is to grip the batim of the shel rosh tightly and pull them away from each other. If they are prudos they will move slightly away from each other as you pull, and you will see movement by the charitz on top. You must do this by all 3 charitzim to ensure prudos.
However not all batim that are prudos will move. Sometimes they are extremely well pressed together, sometimes there is paint (not glue) holding them together. So you cannot say because they don't move when you pull them that they are definitely not prudos.
However I use this pulling method when buying batim and I will not sell as bayis to a Chabad customer that does not pass the pulling test. (BTW if they move too easily, it might be a sign not to buy the bayis as they may split easily and open up in the future.)
If you are checking used batim for prudos, and the pulling test does not work, the only way to be entirely sure is to gently stick a thin but sharp knife into the top corner of the charitz - ever so gently and slightly. This is an art, and if you don't do it properly you will butcher the bayis. I suggest doing this with the bayis being held upside down, incase a piece if paint chips off it will not wedge itself into the charitz and potentially widen the ribua. (If you do it upside down it will fall away from the bayis.)
I would also suggest not doing this without the customers permission. You may wish to discuss what you are doing and why you are doing it, what the risks are, before you do it.
I agree with R' Eli. Always explain the advantage/disadvantage of checking the prudos and let the customer decide. Also make it clear that you do not accept responsibility if it opens then or later.
ReplyDeleteI use a .1mm (10th of a mm) thick piece of metal with rounded edges that is around 3cm wide and 4cm tall with a piece of tape along the top. You carefully and slowly put it in from the sides (and not from the top/center and work your way down until you verify or make it prudos. Never force it.