I'm not certain if it's non-toxic once dry, but it's a great wax, I've used it for year's. The following is copied right off of the side of the can.
"Since 1880" Butcher's Boston Polish, an amber paste wax blended of carnuba and other fine waxes in turpentine and mineral spirits. It is formulated to clean and polish to a hard finish, imparting a satin luster to wood and many other surfaces.
For Floors, Furniture, Antiques, Metals, Leather, Window and drawer slides, musical instruments...
All I know is that my Dad showed me how to use back in the 60's and I've always been able to buy it in the hardwood floor section of my local lumber yard, or hardware store.
It's manufactured by The Butcher Company, Marlborough MA 01752.
It's about 6.50 a can which will easily do a 10x10 room. (The can is orange and looks like a car wax can. They also make a clear product called "Bowling Alley Wax".)
I like it, but then again it's the only thing I've ever used for hardwood floors......