红    契    旧时称买卖田地、房产等经过纳税而由官府盖印的文契。

红契是中国旧时用于不动产买卖、典当，经官府加盖官印并纳税的的契约。

Ming and Qing dynasties to denote real property deeds carrying red seals as official taxation marks

红炉点雪    红叶之题    红日三竿    红腐贯朽    红口白舌