Butter stands next to bread, as an article of diet. It is adulterated, with difficulty, with lard; but the usual way is to mix very cheap butter with a quantity of good butter. Butter is colored by carrots, yellow ochre, and yolks of eggs, and "adulterated by sand and chalk." To detect all of these, melt the butter in hot water. The coloring will separate and join the water, and the other adulterations settle to the bottom.