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When heating the paste, either by microwave or oven, be absolutely sure the paste is just warm for the touch not hot. Otherwise burns towards the skin may result. Items that lack certain qualities can be ruined by attempts to engrave these kind of. Many items today are not solid metal but are cast within an inexpensive alloy and plated finish. In many cases quality plating can survive some engraving processes but typically than not the plating will peal or allow corrosion under the engraving causing severe problems down the r