Sort of greenish. You will be hard put to find the original now though. http://www.blancoandbull.com/blanco-history/the-blanco-shades-over-time/ This will give you the idea.
A lime kiln! Or at least if you heat large stones and then add water the result might well be bang, plus a load of gravel to use as base for roads and wapons pits.
Just think of the H&S drivle required to clean up the vehicle afterwards! :-D A friend of mine used to have the job of cleaning pedestrains of the front of High Speed Channel Tunnel trains.
Surley any oil should give some pressure? Halford's do a very good Classic 20/50. I've used the stuff for a couple of years now, far superior to Straight 30.