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https://www.canada.ca/en/conservation-institute/services/conservation-preservation-publications/canadian-conservation-institute-notes/tannic-acid-rusted-iron-artifacts.html  

여기 들가보면 bluing용 용액 제조법도 상세하게 나와있고 재료들도 인터넷으로 다 판매하는거네.  pH가 2.2-2.4정도로 레몬정도인거 같고 특별히 위험해보이지 않는다.