'48 ON ADRIANOPLE REC, &C. 



cess of oil, leaving none but what was completely saturated 

 with oxigen, and then there would be nothing to feav. 

 Simplest Since the publication of my memoir, I have likewise 



Adrianople Satisfied niyself, that the simplest brightening for Adria- 

 red. nople red, by which the brightest and most lasting colours 



are procured, consists merely in boiling for a very long 

 while with bran-water in a covered boiler, with a tube in the 

 middle of the cover, to let out the steam, and prevent the 

 bursting of the vessel. Care muft be taken hovvev^er, to 

 change the water as oft^n as it grows red, which will be two 

 or three times in the beginning of the boiling; otherwise 

 the thread would be continually taking up the dun particles, 

 which the bran-water had removed, and a bright colour 

 could not be obtained. 

 Process with- All danger indeed might be avoided, without much de- 

 out anger. y^aj-Jon from the simplicity of way process, whether the hanks 

 were heaped up or not. Nothing more is necessary for this, 

 but to give it a coat of olive oil in a very attenuate state, at 

 two different times, after having well steeped it in an alka- 

 line lixivium, washed, and dried it. For this purpose a 

 lixivium of the subcarbonate of potash or of soda is to be 

 made of the strength of 1° or 1 1° on the saltpetre areometer. 

 This must be tried, by mixing with it a few drops of olive 

 oil, to see whether these produce a milky mixture, or rise 

 and float uncombined on the top; for as the alkali may 

 contain more or less foreign matter, t!ie lixivium must be 

 weakened, or strengthened by au addition of alkali, as it is 

 absolutely necessary, that it should assume a milky appear- 

 ance on the trial with oil. When the lixivium is of a proper 

 strength, thirty-two parts are to be mixed with one of olive 

 oil, at first by little and little, and afterward more quickly, 

 stirring it continually the whole time. This milky mixture 

 keeps pretty long, and if the oil begin to rise to the top in 

 the form of cream, the mixture must be stirred afresh. The 

 impregnation of the thread ought to be entrusted to work- 

 men who are most expert^in this process, because the accu- 

 rate distribution of the oily parts has great influence on the 

 evenness of the colour. Each workman should take only asuf- 

 ficient quantity of the milky mixture in any kind of vessel,, 

 . 80 as to be able easily to work it with all possible dexterity 



as 



