The process of subjecting flour to the whitening action of dilute nitrous fumes has grown so extensively during the past ten or twelve years, that it is estimated that more than half of the enormous amount of flour utilised for making bread and for other purposes is now bleached or tinted by this method. Yet none of this bleached or artificially whitened flour is sold to the public as such specifically, or marked by any distinctive label, to show that it has passed through a chemical process.