John, if you want to read up on the British browning process W.W. Greener's book, The Gun, has a good explanation of the different methods he used with his composite barrels. It is on pages 279, 280, and 281. It appears he used browning, black/white, brown dark enough to hide the figure, and various points between depending on the gun and its purpose. It was first published in 1881, so it should be accurate at least for Greener's guns.
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