University of California

Corrosion of metals by milk and its relation to the oxidized flavors of milk


E. S. Guthrie
C. L. Roadhouse
G. A. Richardson

Authors Affiliations

E. S. Guthrie was Professor of Dairy Industry at Cornell University, Ithaca, New York, and Research Associate, University of California, Davis, California, while on sabbatic leave from, Cornell University; C. L. Roadhouse was Professor of Dairy Industry, Dairy Technologist in the Experiment Station, University of California, Davis, California; G. A. Richardson was Assistant Professor of Dairy Industry, Assistant Dairy Chemist in the Experiment Station, University of California, Davis, California.

Publication Information

Hilgardia 5(14):425-453. DOI:10.3733/hilg.v05n14p425. March 1931.

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An oxidized flavor frequently occurs in milk and in practically all of its products. It is often designated as ‘metallic’ because its origin can usually be traced to the exposure of the milk to metal. This flavor varies in intensity in the different stages of its development, but usually the sequence of flavors is as follows: astringent, papery, metallic, metallic and oily, and, finally, tallowy. Some students of this subject have termed it ‘oxidized flavor.’ Inasmuch as it is produced through oxidation it would seem desirable to adopt the latter term, and employ the other descriptive terms to indicate the degree of oxidation.

The dairy industry is much concerned about these flavors, for complaints are being made regarding them in many countries.


[1] Baker M. P., Hammer B. W. The development of metallic flavor in buttermilk. Iowa Academy of Science. 1925. 32:55-58.

[2] Bancroft Wilder D. Corrosion in aqueous solutions. Jour. Ind. and Eng. Chem. 1925. 17:336-338. DOI: 10.1021/ie50184a003 [CrossRef]

[3] Calcott W. S., Whetzel N. C. Laboratory corrosion tests. Amer. Inst. of Chem. Eng. 1923. 15:1-113. DOI: 10.1021/ie50163a007 [CrossRef]

[4] Corse W. M. The corrosion situation and its relation to the work of the American Chemical Society. Jour. Ind. and Eng. Chem. 1925. 17:335-336. DOI: 10.1021/ie50184a002 [CrossRef]

[5] Donauer M. The action of metals on milk. Ice Cream Review. 1922. 5:78

[6] Elvehjem C. A., Steenbock H., Hart E. B. The effect of diet on the copper content of milk. Jour. of Biol. Chem. 1929. 83:27-34.

[7] Emery J. A., Henley R. R. The influence of air, light and metals on the development of rancidity. Jour. Ind. and Eng. Chem. 1922. 14:937-940.

[8] Evans Ulick R. Oxygen distribution as a factor in the corrosion of metals. Jour. Ind. and Eng. Chem. 1925. 18:363-373. DOI: 10.1021/ie50184a012 [CrossRef]

[9] Fraser O. B. J., Ackerman D. E., Sands J. W. Controllable variables in the quantitative study of the submerged corrosion of metals. Jour. Ind. and Eng. Chem. 1927. 19:332-338.

[10] Frazier William C. A defect in milk due to light. Jour. Dairy Sci. 1928. 11:375-379. DOI: 10.3168/jds.S0022-0302(28)93650-4 [CrossRef]

[11] Golding John, Feilmann Ernst. Taint in milk due to contamination by copper. Jour. Soc. Chem. Ind. Nottingham Sec. 1905. 24:1-9.

[12] Guthrie E. S. Metallic flavor in dairy products. New York (Cornell U.) Agr. Exp. Sta. Bul. 1916. 373:605-644. DOI: 10.5962/bhl.title.34615 [CrossRef]

[13] Hunziker O. F. Selections of metals in the construction of dairy equipment. Proceedings of the World’s Dairy Congress. 1923. 2:1189-1202.

[14] Hunziker O. F., Cordes W. A., Nissen B. H. Metals in dairy equipment. Jour. Dairy Sci. 1929. 12:140-181. DOI: 10.3168/jds.S0022-0302(29)93566-9 [CrossRef]

[15] Hunziker O. F., Fay Hosman D. Tallowy butter—its causes and prevention. Jour. Dairy Sci. 1917. 1:320-345.

[16] Miscall J., Cavanaugh G. W., Carodemos P. P. Copper in dairy products and its solution under various conditions, II. Jour. Dairy Sci. 1929. 12:379-384. DOI: 10.3168/jds.S0022-0302(29)93587-6 [CrossRef]

[17] McKay R. J. Corrosion. Jour. Ind. and Eng. Chem. 1929. 21:35-36.

[18] McKay Robert J., Fraser O. B. J., Searle H. E. Practical application of corrosion tests; resistance of nickel and monel metal to corrosion by milk. Amer. Inst. of Min. and Met. Eng. Tech. Pub. 1929. 192:1-47.

[19] Olson George A. Rusty cans and their effect upon milk for cheesemaking. Wisconsin Agr. Exp. Sta. Bul. 1902. 162:1-12.

[20] Palmer L. S., Combs W. B. Relation of the enzymes of butter to the production of tallowiness by copper salts and over-neutralization. Jour. Dairy Sci. 1919. 2:444-452. DOI: 10.3168/jds.S0022-0302(19)94345-1 [CrossRef]

[21] Quam G. N. Solubility of metals in milk. Jour. Ind. and Eng. Chem. 1929. 21:703-704. DOI: 10.1021/ie50235a027 [CrossRef]

[22] Quam G. N., Soloman E. I., Hellwig Arthur. Influence of rate of corrosion of copper by milk. Jour. Ind. and Eng. Chem. 1928. 20:930-931.

[23] Rawdon Henry S., Krynitsky A. I., Finkeldey W. H. Types of apparatus used in testing the corrodibility of metals. Am. Soc. Testing Materials Proc. 1924. 24(pt. 2):715-734.

[24] Rice F. E., Miscall J. Copper in dairy products and its solutions in milk under various conditions. Jour. Dairy Sci. 1923. 6:261-277. DOI: 10.3168/jds.S0022-0302(23)94089-0 [CrossRef]

[25] Rogers L. A. Report of Chief of Bur. 1928. Dairy Ind., U. S. Dept. Agr. 52p.

[26] Rogers L. A. The Associates of. Fundamentals of dairy science. 1928. New York, N. Y: The Chemical Catalogue Co. 544p.

[27] Rogers L. A., Berg W. N., Potteiger C. R., Davis B. J. Factors influencing the change in flavor in storage butter. U. S. Dept. Agr. Bur. Anim. Indus. Bul. 1913. 162:1-69. DOI: 10.5962/bhl.title.43597 [CrossRef]

[28] Seligman Richard. Milk and metals. Proceedings of the World’s Dairy Congress. 1923. 2:1202-1212. DOI: 10.1111/j.1471-0307.1952.tb01570.x [CrossRef]

[29] Speller Frank N. A study of corrosion factors and electro-chemical theory. Jour. Ind. and Eng. Chem. 1925. 17:339-346.

[30] Speller Frank N. Corrosion—causes and prevention, xii + 621 p. 1926. New York City, N. Y.: McGraw-Hill Book Co.

[31] Speller F. N. Corrosion—A problem in protective coatings. Jour. Ind. and Eng. Chem. 1929. 21:506-510.

[32] Supplee G. C., Bellis B. The copper content of cow’s milk. Jour. Dairy Sci. 1922. 5:455-467.

[33] Thompson G. F., McKay R. G. The control of motion and aeration in corrosion tests. Jour. Ind. and Eng. Chem. 1923. 15:1114-1117. DOI: 10.1021/ie50167a004 [CrossRef]

[34] West Perry. Prevention of corrosion of metals by water in a closed system. Jour. Ind. and Eng. Chem. 1922. 14:601-607. DOI: 10.1021/ie50151a006 [CrossRef]

[35] London Conference of the Electroplaters’ and Depositors’ Technical Society. Recent progress in electrodeposition and a discussion on the present position of chromium plating. J. Electroplaters’ and Depositors’ Tech. Soc. 1930. 5:107-126.

Guthrie E, Roadhouse C, Richardson G. 1931. Corrosion of metals by milk and its relation to the oxidized flavors of milk. Hilgardia 5(14):425-453. DOI:10.3733/hilg.v05n14p425
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