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A the book claims it treats? Alternative, modern sources discussing blue iodine?

The book likely details how to safely make the mixture at home. A the book claims it treats

Blue iodine was famously utilized during severe sanitary crises in the Far North (e.g., against dysentery) to treat severely weakened patients, often reducing symptoms significantly within 3–4 days. Proposed Health Benefits (Traditional/Folklore): A the book claims it treats