No person shall sell or offer for sale any flour, meal, grits or hominy, made from the admixture or adulteration of grains, unless there shall have been first branded upon each of the barrels or packages containing the same, the kind of grains composing said admixture, the quality and weight thereof, and the name and place of business of the person manufacturing the same; provided, always, that the admixture of the several grades or kinds of wheat shall not be construed to be mixed or adulterated grains.