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You can blanch a dried leaf like IAL, which has the effect of removing some tannins and causes the dried leaf to soften and breakdown faster than a non-blanched dried leaf. If you freeze the leaf, there is no need to blanch it again. Freezing breaksdown the leaf's cell walls, and has the same effect as boiling/blanching the leaf. So you can choose one or the other. We blanch because it is a lot faster than waiting for the leaf to freeze.