These are terra de sienna, asphaltum, dragon's blood, carmine, rose-pink, chemical brown, all the lakes, gamboge, and all the gums. Semi-transparent: umber, Vandyke brown, chrome red, emerald green, Brunswick green, ultramarine, indigo, and verdigris. Transparent colors are purer if ground in water; allow them to settle, pour off the top part of the settlings: mix that with more water; let it settle, and take the top half of that, which will be free from all sand and grit. Turpentine makes transparent colors work crumbly. Bleached boiled oil or white varnish is the best vehicle for flowing evenly.