cover 1906 (15 Feb.) envelope to Washington D.C., bearing KE 10c. tied by type Dvii c.d.s. in rusty brown with another strike alongside and showing, on reverse, Hong Kong and San Francisco transit d.s.; also a similar 1905 envelope from the same correspondence with identical cancellation in black. Very scare, Webb states that this colour ink was used as an arrival cancellation on mail coming to Canton by river steamer from Hong Kong