The blue of the vat is only used for such articles as are to have a green cast, and that extremely light; the aluming also should be in a weaker alum liquor: for light lemons it should be prepared in a separate liquor. _Preparation of annatto for_ AURORA, ORANGE, MOIDORE, GOLD COLOUR _and_ CHAMOIS. You must have a colander proportioned to the size of the copper in which you boil the annatto. To every pound of annatto put from twelve ounces to one pound of pearl-ashes, which last dissolve in water, and add the solution, by degrees, to the solution of annatto as it boils and dissolves, for which purpose the annatto must be suspended in the colander over the copper by a flat stick about six inches broad, run through a flat handle on each side of the colander, by which means the colander is kept sunk in the water with the annatto in it, till it is all dissolved, except some little foreign matters. The holes in the colander should be moderately small. Dissolved in this manner the annatto, if kept clean, will keep as long as you please. _To dye silk_ AURORA _or_ ORANGE. These require but twenty pounds of soap for boiling white. To dye _aurora_ the silk must be prepared the same as for yellow. Annatto _prepared_ (as directed in the last article) and settled, is then put into a copper of hot water, in quantity according to the shade required; having mixed it well, the liquor being as hot as the hand will bear, put the silk into it; when one hank is tried, as in the yellow, if it be not full enough, the liquor must be strengthened till the colour is brought to the shade required. When finished the whole must be washed twice and beetled. The _aurora_ serves as a ground for _moidore_. _To dye_ MOIDORE. As fustic and logwood are to form part of this dye upon the annatto ground, the silk must be alumed, then washed from the alum, in order that the superflux of the alum may not render the dye uneven. A fresh liquor is then prepared, rather hot, to which must be added a little of the decoction of logwood, and of the decoction of young fustic. The silk is re-turned in this liquor, but if apparently too red, you may put in a very little of solution of sulphate of iron, which will make it sufficiently yellow. When the silk is dyed with the gum, in the raw state, the annatto must be used nearly cold, or the elasticity of the silk will be destroyed. _Process for_ ORANGE. After dyeing aurora with annatto, it is necessary to redden the annatto ground with vinegar, alum or lemon juice.