Grebgory, Thanks for the informaton. The color in the photograph was not corrected and tended to show color into the green bands giving the effect of a "khaki" glow. At least it got some to respond about cylinder colors and baked on castor oil. The engines took on a kind of brownish black color very similar to the outside rim of a cast iron frying pan even though the cooling fins were turned from aluminium stock (edit: they were made of forged nickel steel). Experiments show painting the base with aluminium paint followed by several coats of medium black wash misxed with a small amount of sienna gives the best effect. I'll try and take shots that are color corrected so the colors are presented fairly accurately. Best regards, Gil P.S. Further research resolved the materials issue as regards the cyclinders...., they were turned out of steel so the frying pan analogy is pertinent.