I have been contemplating the Hornby S15 and the weathering to date, which came out just a little too brown for my liking. I mixed up some Humbrol coal black #85 as the predominant colour, with a tinge of Humbrol #66, olive drab, and even less Humbrol #62, leather. The whole lot was then mixed with some matt varnish and 'watered' down with turps to form a grey, almost black wash.

I am much happier with the result, but I'll leave it to you to judge for yourselves.