This preparing liquor should mark nom 4° to 5° Tw., and land the pieces are then dried, either over the drying tins or I the metal plate or roller is perfectly elean and free of any must throughout be kept up to this strength by adding salts by hangmg up in a warm room. greasy places; ordinary paper is next laid over the tracing in the proportion!! indicated, more or less as may be required, Bluing.-The parts not printed upon, and which should be paper, and moderate pressure applied to the

more »

... drawn but not departing from the relative quantities of tartar and 'white, are always found to be somewhat tinged by the OP-I surface. If it be intended to transfer direct to the actual tin solution. erations of steaming and washing ; it is necessary, therefore, printing roller, then the fl ax paper is first unlapped in a spiral Upon the proper management of this preparation depends to remedy this defect as far as possible, and for th . at purpose I · fashion with a piece of weIl calendered and stiffly held calico in a o-reat degree the success of the after processes. the pieces are passed full width in a box fitted up with roll-fastened to the printing roller. After a lapse of several Wllen the foulards are to have a white ground or a light ers, through water mixed with solutions of ammoniacal cochii hours-twelve hours at the utmost-the tracing paper is colored ground, the preparation should be done cold, i.e., at neal and sulphate of indigo. Sufficient of these two colors I again removed from the metal surface, upon which farnt about 60" to 70° F. In this case the foulards are simply im-is added to give a fine purpIe color to the water, but the ac-lines ma y be seen corresponding to the tracing, through the mersed in the tin and tartar solution for four or five hours, tual quantity necessary has to be regulated according to the action of the iodide of mercury on the meta!. lf the plate, moving them now and then, so as to insure an equal degree particular circumstances, and can only be learned by experi-roller, or mi1l be exposed to the atmosphere during several of contact with the liquor. ence. A sampIe of the proper white wanted is kept at hand days, these faint lines develop themselves into elearly per-For goods which are to have dark blue and dark green in a moist state and compared with the �oods from time to ceptible, more or less dark gray lines, which cannot be re grounds, and also browns and blacks, the temperature of the time, and the strength of the bluing liqUI d altered as may be moved by rubbing with the moist or dry hand, and wh ich, preparation must be raised to 140°. By employingthis higher i required to produce the proper tinge. consequently, the hand of the engraver cannot obliterate. temperature more tin is fixed upon the stuff, and the colors 1 .FinisMng.-The foulards are impregnated either by hand Moreover, if such a tracing on flax paper be kept from the