We must preface this portion of our book with the remark that when we speak of white lead, we mean by that term the hydrated carbonate of lead, known to painters as keg lead, when ground in linseed oil for their use, but of late known to the general consumer as corroded white lead, in distinction from basic sulphate of lead or sublimed lead. The latter will be dealt with later on as we proceed.

This being a description of methods employed to manipulate the dry pigment for the use of the consumer, we shall refrain from a description of the various processes in use for manufacturing the dry white lead, only incidentally touching upon these for a better understanding of the characteristics, miscibility, etc.

Historical. - Going back thirty years, there were exactly thirty firms corroding white lead by the "Dutch" process, yet white lead was made in this country as early as 1807, but up to fifty years ago about three-quarters of all the white lead used was imported from abroad, mostly from England. And it is a fact well known to the veterans in the trade that the bulk of these importations was not pure white lead, although so branded, but more or less "stretched" with barytes. The corroders in this country, however, at an early date agreed not to sell any of their products under their name, except the strictly pure article, and if at this day any firm corroding white lead in oil sells or offers for sale any brand of white lead in oil that is extended with any other material, it is not branded white lead, but is labeled with some fancy name or brand.