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A synthetic, tetragonal crystalline form of Aluminum oxide. As an abrasive, gamma alumina removes silver tarnish effectively with few visible scratches (Wharton, et al, 1990).
Properties of Common Abrasives
Resources and Citations
- G.Wharton, S.Lansing, W.Ginell, "A Comparative Study of Silver Cleaning Abrasives" JAIC 29:13-31, 1990. LINK