This stone seal appears normal until used to seal a document, but the mark it leaves is instantly recognisable as magical. The document will radiate strongly the sense of whoever sealed the document. Anyone who holds, reads, handles, or even views the document will be aware of who sealed it. The document cannot be separated from the mark, nor the mark destroyed without destroying both mark and document. The seal has the power that it can mark any substance used for a message, be it papyrus, clay, stone or metal.