Abstract
Many of the commercial sheet steel enamels are readily attacked by such weak acid solutions as fruit juices and are stained by milk and by some city waters. This paper gives the development of a number of acid-resisting enamels. It shows that acid resistance is the result of the right combinations of raw materials rather than the presence or absence of any particular constituent. Acid resistance is not affected by fineness of grinding or by the smelting conditions if the enamel is properly smelted. Mill additions of clay reduce the acid resistance but opacifiers added in this manner have no effect. Temperature and time of firing may or may not affect the acid resistance depending on the composition of the enamel.
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