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Use "toning" in a sentence
"Even the toning is constantly changing -- no static, same-move repetitions."
"For an explanation as to why natural toning is highly favored by sophisticated collectors and as to why ‘coin doctoring’ is so terrible, please see my three part series on this topic, Part 1, Part 2, Part 3."
"Likewise, attractive blue, purple and green toning is often counterfeited."