ON ADRIANOPLE RED, &.C, 49 



as many hanks as he can wring out with facility. Thus he 

 will ^o on, taking constantly the same number of hanks, 

 and the same quantity of milky mixtvire. What he wrings 

 out he will put into a separate vessel, and restore to it by his 

 eye the quantity of oil the thread has absorbed^ if the trifling 

 value of this residuum, which will contain but little oil, do 

 not induce him to throw it away. The impregnation may be 

 performed in the whole quantity of milky mixture, but then 

 the quantity of olive oil, that the hanks have absorbed, will 

 continually require to be replaced by the eye, as soon as the 

 intensity of the milkiness appears to be diminished : the art 

 of doing this however is easily acquired by practice. After 

 having dried all the hanks together, they are to be impreg- 

 nated a second time, in the same manner as before, but 

 without washing them first: and when they have been again 

 dried, they may be impregnated without previous washing, 

 once, twice, or three times, with the pure alkaline solution 

 of alumine without oil, in the manner described in my me- 

 moir. When they come to be dyed the colour will be more 

 or less deep, in proportion to the number of impregnations. 



To obtain light tints however, and at the same time even. For light tints. 

 it is better to impregnate them three times, weakening the 

 alkaline solution of alumine proportionally. The thread 

 might also be impregnated with this solution, either strong 

 or weak, three times following, without previous washing ; 

 which would greatly diminish the number of operations, that 

 are certainly tedious and troublesome: but in this case the 

 solution must be examined from time to time, to see whether 

 what the impregnated and dried thread discharges into it 

 do not render it too strong. 



On redyeing red colours, it must be recollected, whether Redyeing reds. 

 they were brightened by boihng in bran-water, or by means 

 of soap and alkalis. In the first case they grow deeper by at- 

 tracting the colouring particles of the madder ; in the second 

 they are weakened, and lose their excess of alumine, without 

 which repeated dyeing produces no effect. The removal of 

 this excess of alumine may be prevented, by substituting for 

 soap and alkalis, in order to produce crimson tints, a portion 

 of the alkaline solution of alumine, which is to be ad^ed to 

 the bran-water toward the end of the brightening. The Real Adrian- 



Vol. XXI— Sept. 1808. E true 



