Is one permitted to shake dew off a new black garment on Shabbat?
Synopsis
The Mechaber rules that shaking dew off a new black garment one is particular about is a Torah-level prohibition (chayav), because shaking is as effective as laundering for such garments. The Mishnah Berurah clarifies that 'new' means it has not yet been used extensively enough to lose its newness, and the prohibition applies specifically to black garments because the improvement from shaking is noticeable on them.
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