It should be mentioned that the large dyers of Adrianople red, now obtain their soda for lixivium No. 1, by using common salt in solution, to which is added a solution of pearl-ashes. On boiling these together a muriate of potash is formed, which is taken out of the liquor with a skimmer; a _carbonate of soda_ remains dissolved in the liquor, and is, of course, applied to the same purpose as, and at a much cheaper rate than, the Alicant soda. CHAPTER VI. ON DYEING COTTON AND SILK. _To dye skein cotton yellow—On dyeing and re-dyeing cotton furniture yellow—To dye cotton skein a duck's wing green and olive—Of browns, maroons, coffee colours, &c.—Observations on silk—On ungumming and boiling silk—Whitening—Sulphuring—On aluming silk—Skein silk for yellow—Preparation of annatto, for aurora, orange, moidore, gold colour, and chamois—To dye silk aurora or orange—To dye moidore—Process for orange—To dye silk poppy or coquelicot—A cheaper poppy with annatto and Brazil wood—On dyeing silk a fine crimson—Composition for dyeing silk scarlet or crimson, with cochineal—Another process for crimson—Crimson by Brazil wood—Of fine violet—Observations on crimson and scarlet upon silk—On dyeing silk green—On olives—On dyeing silk grey—Nut-Grey—Black greys—Iron greys—On dyeing silk of a Prussian blue colour—Chromate of lead for yellow on silk or cotton—Conclusion._ We have in several preceding chapters treated of both _cotton_ and _silk_; we shall here treat of certain processes and colours relative to both these substances, which are most conveniently arranged in this chapter. The simpler processes for _cotton_ will be found in the _second_ chapter, the more complex in the _fifth_; the simpler processes for _silk_ are given in the _third_ chapter, the more complex in the _fifth_; the remaining processes for both in the present chapter, will conclude the work. _To dye skein cotton_ YELLOW. The same operations as those in the first common red dye are to be used here; to one pound of cotton four ounces of roche alum, and from one to four pounds of weld. When dyed the cotton is to be worked in hot, but not boiling, liquor, consisting of four ounces of sulphate of copper to every pound of cotton; it is then to be boiled for three hours in a solution containing four ounces of soap to every pound of cotton. When a dark or _jonquil colour_ is wanted, no alum is used; of weld take two pounds and a half, very little verdigris, or a little alum in its stead, but nothing else. For brightening, however, boiling in a solution of soap is in all cases necessary. _On dyeing and re-dyeing cotton furniture_ YELLOW.