18th Century Brass Trade Kettle.
I guess I am probably too late to reply to this thread, but I will offer this info anyway just in case it is of any use now.
As far as I know, brass contains lead, so you should not cook in it or eat from it. Foods containing more acid than others will probably go black if cooked in brass, such as tomatoes for instance.
The good news is that you can purchase tin lined copies of the 18th century brass or copper trade kettle.
This one is much smaller than the one you show in your image, & is more suitable for carrying in a knapsack.
Two roads diverged in a wood, and I took the one less travelled by,
and that has made all the difference.