340 Method of giving to Cotton and Linen Thread 



lision the final determination rarely was the effect of reason;, 

 but Gtneialivnr ou.ei- decisive powers. 



He died Sept. 2.5, 1777, of a decline, after having ren- 

 dered to the sciences services that will be recollected with 

 gratitude by the latest posterity. P. W. 



LX. Addition to a ISTemrAr on the Method of giving to 

 Cotton and Linen. Thread the Adrianople Red, aiid other 

 fixed Colours. By J. M. Hausskian*. 



X o give to cotton and linen thread all kinds of durable co- 

 lours, nothing is iv-.cessary but to fix on fh( se threads, in 

 any manner whatever, more or less aluniinc, after having 

 applied lathcm a slight stratum of oil. The complete suc- 

 cess of the result, however, depends on certain modifica- 

 tions to be observed in the processes. 



The numerous trial-? which I made in dyeing had so much- 

 familiarised me witl-i experiments on a small scale, that I at 

 last never failed. It was only alter I published my memoir 

 on madder.ng inserted in ihc, Aiwales de Chiviief, that I ex- 

 perienced any dii^euhies in the application of oil when ope- 

 rating on a lai ger scale. Linseed oil, which had always given 

 meainilky mixture iu limited proportions with alkaline solu- 

 tion, then speedily separated when I wished to make a larger 

 provision, and under these circumstances the impregnation 

 of the skains became, impossible, 'j'he case was the same 

 with all the fat oils: fish oil, however, will remain in 

 mixture for a considerable time; but its odour is too dis- 

 agreeable. 



To remedy the inconvenience of the separation of oil in 

 the alkaline solution of alumine, I had recourse to drying 

 oils; that is to sav, oil boiled with metallic oxides. Lin- 

 seed oil boiled with minium, cerusf, or litharge, by means of 

 water to prevent>combustion, dissolves a considerable portion 

 of the oxide of lead, and will keep naixed with the alkaline 

 solution of alumine, under the milky form, the whole 

 time necessary for the impregnation of the skains. By 

 employing this mixture in proper proportions, and in the 

 manner 1 have indicated in my memoir, following strictly 

 in other respects the process such as I have described it, one 

 cannot fail to obtain beautiful and lasting colours. However, 

 notwithstanding the simplicity of this process, I cannot re- 



*' From the Jlniales de Chimie, No." 144J. 

 ■f Sc; Philosophical Magazine, vol. sn. 



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