Colour.
shades, grayish-greens, and blue-greens. Of these, the shades tending to grayish-green are the most manageable in large masses. There is also an olive-green that is good, if not too dark and brown, when it becomes a nondescript, and as such to be condemned.
Walnut (the roots or the husks or the nut) and catechu (the juice of a plant) are the most reliable brown dye-stuffs, giving good rich colour. The best black, by the bye, formerly used, consisted of the darkest indigo shade the material would take, dipped afterwards in the walnut root dye.
This hasty enumeration of dye-stuffs gives an idea of those principally used until this century, but now very rarely, since the reign of Aniline. Yet they give the only really pure and permanent colours known, not losing their value by artificial light, and very little and
