Tung oil is a "drying oil" like linseed, safflower, walnut and other vegetable oils. But these oils don't "dry"; they "oxidize" when exposed to air and in a chemical process called "polymerization" molecules link together and form a tough flexible film. If you added a pigment you would have an "oil-modified, solvent-based" paint commonly known as "oil-based paint".
Tung oil, like other drying oils, cannot be applied in its pure form; it must be thinned with a rapid drying solvent like mineral spirits to make it easier to apply and able to penetrate the surface of the wood. Also, raw tung oil has poor moisture/water vapor resistance and poor protection from abrasion. Water will leave a mark on the surface and you would need to re-apply the oil every year or so. So tung oil must be heat-treated in order to start and accelerate the polymerization process that will result in a surface tough enough for a floor.
Unfortunately making a serviceable tung oil finish is expensive so many manufacturers substitute chemical additives to the raw oil that speed up oxidation (called dryers) and often mix it with cheaper oils. The resulting concoction can be so toxic that it would be virtually impossible to know immediately what element had caused someone an adverse physical reaction.
When shopping for a Tung oil floor finish look for "polymerized tung oil" in a low VOC solvent base and expect to pay a premium for it. Sutherland Welles Ltd. is one supplier.
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