Thanks Pete.
I found this in the 1907 Greener's The Gun on p. 237

“The numerous twistings and weldings of gun-iron rods and ribands are fully detailed…and it must have occurred to the reader that the Damascus barrel is one mass of welds from breech to muzzle. This is so. Unfortunately a certain amount of burnt metal, or scale, is imbedded within some of the welds, and in the finished barrel this fragment of scale forms a “grey”…which will not colour in harmony with the other part of the barrel, but is made more apparent by the finishing processes of polishing and browning. These “greys” may appear some time after the gun has been in use, the hard metal composing the barrel being eaten into by rust…They are developed in the inside by the chemical action of powder gases, and are almost ineradicable. The harder the Damascus the greater the liability to “greys”…

I'm not sure the bulleyes on Leighton's Remington are "greys"

Last edited by revdocdrew; 10/20/07 09:02 AM.