Chinese origin of correspondence-paper with black margins as used during mourning.
In Europe there is the custom of observing mourning at the loss of a relative by using, even in correspondence, paper with a black margin. This may be traceable to China where a document on such a paper has been offered as the original.
Mahdihassan
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D002681:China; D003116:Color; D006801:Humans; D009027:Mortuary Practice; D010209:Paper; D014956:Writing