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Tout savoir sur les téfilines – Rabbin et sofer stam en France
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https://www.royaljudaica.com/product/dyochanan-carbon-ink-for-sofer-stam-for-halachik-hidur-and-quick-writing-/1825
DYOCHANAN Carbon Ink for Sofer STaM for Halachik Hidur and quick writing דיוחנן דיו עשן שמנים |...
Carbon ink has a Halachik Hidur and may also be used as an additive to other Dyochanan ink's for increased flow of ink. דיוחנן דיו עשן שמנים
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