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I am not sure how much tannins are in a magnolia leaf. If you already have some on hand, put a couple in a glass of water and see how long it takes to look like tea. When you boil them does that water turn colors? If not, or just a bit, then there is likely not much tannins in the leaves.

Are you using Magnolia grandiflora? Those are really sturdy leaves, ought to hold up really well under water.
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