Red - vermilion, drop-lake, rose-pink, Venetian red, red ochre. Blue - indigo blue, Prussian blue, verditer. Orange - orange lead, orange orpimeat. Black - ivory, blue black. Yellow - Dutch pink, yellow ochre, king's yellow, English pink. The finer the colours are ground, the better and the cheaper will the work be. First the colours should be finely pounded, then mixed with water to the consistence of paste, and put in a colour pot with the knife. From the pot, the colour must be taken out a little at a time, and levigated very fine with pure water.

Compound Colours are made by mixing the colours above mentioned in certain proportions. To make a red colour, mix 3 parts of rose-pink with 1 of vermilion. A finer red - 4 parts of rose-pink, 2 ports of vermilion, and 1 part of drop-lake; for very fine work use drop-lake alone, but use it very sparingly, for it is a dear article. Yellow - 2 parts of Dutch pink, and 1 part each of king's yellow and English pink. Green - made by mixing blue and yellow. Dark blue - indigo, which may be made lighter by the addition of ver-diter. Orange brown - 2 parts of Venetian red, and 1 part of orange lead. A fine orange - put some fine yellow ochre in a ladle over a fire, and keep it there till it assumes a dark-red colour. Take of this red ochre, finely pounded, and of Venetian red, equal quantities, and add a little orange orpiment or rose-pink; mix all well together. Umber colour - equal quantities of Venetian red, orange lead, and ivory black; this can be lightened with orange lead, or darkened with ivory black. Cinnamon colour - Venetian red with a little Prussian blue. All other colours which may be wanted can be made by mixing together those already described. In addition to the articles already mentioned, obtain a bottle of ox-gall, a bottle of good oil of turpentine, some pure water.

The trough must be filled to within -1/8 inch of the top, with a solution of gum tragacanth, which is prepared as follows: Gum of a pale white semi-transparent appearance is to be soaked in water for at least 48 hours, in the proportion of 1/2 lb. to 1 1/2 gallon. Pass the solution of gum through a hair sieve or linen cloth, and pour it into the trough. In all cases, when the trough is to be used, the solution should be well stirred up with a few quills, and the surface of it cleared from film by the skimmer above described.

Colours intended to represent Veins are made by adding a small quantity of gall to the various colours, and stirring each well up with a brush, in order that they may be properly mixed. Previous to use, these mixtures of colour and gall are thinned with water to the consistence of cream, and well stirred up.

Colours for producing Spots like Lace-work.

Take some dark blue, or other colour, add some gall to it, and about as much, or a little less, oil of turpentine; stir all well together, and dilute with water. To try the colours, throw on the solution, by shaking the various colour brushes over it, some spots of colour. If the spots spread out larger than a crown-piece in size, the colours have too much gall; if the spots, after spreading out a little, contract again, there is too little gall in them. In the one case more colour must be added, in the other more gall. If the colours arc in good order, and paper is to be marbled, the whole surface of the solution in the trough must be covered by colours, in spots, streaks, or whirls, according to the pattern required, and laid on according to directions which will be given presently. The paper should be previously prepared for receiving the colours, by dipping it overnight in water, and laying the sheets on each other with a weight over them. The sheet of paper must be held by two corners, and laid in the most gentle and even manner on the solution covered with the colours, and there softly pressed with the hand that it may bear everything on the solution, taking care not to let the colours flow on to the back of the paper any more than can be avoided: after which it must be raised and taken off with the same care, and then hung to dry over the rods.