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Originally Posted by Matchlock
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
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Michael- I'm no expert, and I'm not trying to contradict you or your experience- just passing along info I gathered from Dr. David Scott, Chair of the UCLA/Getty Conservation Center, professor at UCLA, and author of the two most important metals conservation books to be published yet.
Regarding the knife, does it appear the bone handle has been turned to shape?