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Originally Posted by G. McCormack
My understanding is that washing may be the best option, and that the tannin treatment really doesnt do anything.
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Sorry to differ but in my 30 years of restoring experience, tannin has definitely proved to have a both cementing and tightening effect. Moreover it generates a very smooth and homogenous black surface. Nor more problems with material losses of excavated iron objects!
You may ask any good museum restorer.
Michael