First, I forgot to thank Carronader for posting that great looking green Bombard/Mortar. Looking at that huge stone ball, you can just imagine the royal artillery "Stone Ball Chiselers" at the bars every evening in the weeks before the Royal Artillery Train went on campaign. They would be singing popular songs and there would be a great deal of tankards clanking together and yelling of "Here's to OVERTIME, sweet, sweet overtime!"
Thanks to everyone for all those paint suggestions and research info. Rick, I noticed that even the Japanese like "Paris Green" as an ingredient in one of their modern warship paints. Milk paints are also very interesting and go way, way back in their use history. They are great for kid toys too, being non-toxic. The chemical that would probably be my first choice for a prime ingredient would be the cupric oxide that you mentioned. But, alas, it just isn't so. In further reading we were finally able to uncover a paint recipe and it is from an official contemporary source.
In 1789, the first year in which the use of green paint for artillery carriages occurred in France, General Gassendi recorded the new paint's formula. We think that his command may have been charged with reporting on the durability of the new paint under field conditions. He reports that a batch which would cover 18 caissons with one coat consisted of 36 pounds of yellow ochre, 3 pounds of fine powdered black charcoal, 1 pound 8 ounces of litharge ( a protoxide of lead, it's chemical reaction with oils helped dry the paint ) and 20 pounds of linseed oil.
So, how can yellow and black make green? To understand that you must be much more familiar with pigments than we are, but it's handy to remember that in the visible spectrum, the presence of all colors yields white light, but in Degas', Delacrois' and Millet's world, the presence of all pigments yields the color, black.
Allen, you were the first to mention lead, right on. And Victor, thank's for your continued confidence in us, just hope that it's not in vain. Actually, we are predicting a late next week unveiling if all comes together as we have scheduled it. Lots of clear coat in this thing, Victor, lots and lots!
Regards,
Mike and Tracy