Question:
Is it permissible to buy Orange juice that doesn’t have a HECHER for Pesach-on Chol hamoed Pesach-to be used after pesach, since it is NOT MAMESH Chometz–probably Kityanos.
Answer:
If you are not planning on using it during chol hamoed, or you tov, it is hachana (preparing for after Yom Tov) which is not allowed on chol hamoed.
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