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Question
Are there any requirements regarding Tefillin polish? Can any black marker be used?
Answer
Any black marker may be used, providing that it is not made of forbidden materials (non Kosher animal).
Rabbi Zalman Baruch Melamed

Kashrut of a corelle plate
Rabbi Chaim Tabasky | 6 Tevet 5766

Jews murdering prophets
Rabbi Ari Shvat | Tammuz 2, 5780

Praying Without Moving Your Lips
Rabbi Jonathan Blass | 12 Cheshvan 5764

Chol Hamoed and laundry
Rabbi Chaim Tabasky | 3 Cheshvan 5766

Yiddish to Hebrew
Rabbi Ari Shvat | Shevat 1, 5785

Gentile inferiority due to genetics.
Rabbi Yoel Lieberman | Adar 6, 5785

Re how does God do terrible things to people
Rabbi Ari Shvat | Tevet 26, 5785
