Chemical preservatives are not permitted in any milk products, according to Dairy Farmers of America. Instead, pathogens and harmful bacteria are controlled by combination of heat treatment (pasteurization), refrigeration and protection from light. Additionally, most milk sold for public consumption is homogenized, which prevents the creme from separating.
Despite this, preservatives are still used in dairy heard improvement milk samples when refrigeration is not practical. In fact, their use is required under these circumstances in most states. Some of these preservatives are toxic, and milk that contains these preservatives is not meant for human consumption.
The totally unnecessary consequences that are revealed by your recent official inquiry are scandalous. Dairy men evidently—and must constantly—find the milk they have to sell, not only in an advanced, but also dangerous state of fermentation, which, in self-interest, they can only, however, temporarily suppress by the processes of drugging, late-refrigeration and other disorganising practices, through neglect in the country of purifying and cooling the milk at once when drawn warm from the cow. There are plenty of simple portable appliances to use for the purpose, so why should not farmers have them, and rural ice depots near railway stations for refrigeration of milk, as well as Continental, and notably American, country milk producers?
Potassium Dichromate is a low-cost preservative that has color to indicate its presence in the milk. It is easily dispersed throughout the milk sample. It is a toxic substance that tends to deteriorate the fat in samples, and also pollutes the sewer system. Formaldehyde is another low-cost preservative easily dispersed through milk samples. However, it was found unsuitable for test milk samples because it interfered with fat tests in electronic equipment.
Bronopol(C3 H6 BrNO4, CAS No. 52-51-7) is also a low-cost preservative that is easily dispersed through milk samples. It has low toxicity levels. Bronopol must be stored under dry conditions, and does not prevent the growth of yeast in unrefrigerated samples. Hydrogen peroxide has a low toxicity level, is inexpensive, and is easily dispersed through milk. The disadvantages of hydrogen peroxide are that it has a short preservation time and adds no color to the samples.
By all means let the prohibition be utterly complete, and thus allow the consumer to drink nature’s production and not chemical compounds. In the world the use of any drugs has long been prohibited, and our milk is superior and never complained about, and were drugs permitted a general protest would result.