Having just added
Norman Macmillan's combat report for Sept 11, 1917 to my database, I would note that he was credited with two Triplanes OOC. In the report he describes them both as "buff all over". Interestingly his report does not give the time, and there is a note at the bottom, undoubtedly from Wing HQ, "time please?". From other evidence I have the time as 1525. Interestingly, (Wing?) HQ notes only 1 out of control to be credited, while the forthcoming Communiqué (#105) gave him credit for two (which is what he claimed, although obviously [to us] it was the same plane; it should be noted that these should not be refered to as "victories", they were considered "decisive combats" by the British).
Another combat report from September that I have entered, that give color information, is also for Sept 11, at 0940, by 2/Lt J Machaffie (anybody have his first name?) of 29 Sqn, who notes it as green-grey; no claim was made, and the combat was indecisive.
On Sept 16 at 1600, 2/Lt R M Strang (names, anyone?) of 19 Sqn, had an indecisive combat with a dark brown triplane.
The last 1917 reference to a triplane was on Oct 2, by 2/Lt
Keith Knox Muspratt of 56 Sqn. The next was on Jan 13, 1918 by DH-4s of 49 Sqn.
Frank.