J56 OK THE MURIATE OF TIN. 



much energy *. a considerable quantity of caloric is evolved, 

 and after it is cold the liquid coagulates into a mass of 

 silky crystals of muriate of tin. If the crystals of muriate 

 of tin be purified by dissolution in pure water and recrystal. 

 lization, they will acquire more consistence and more density. 

 Crystallized muriate of tin is very soluble \u cold water, 

 the solution being quickly effected, and producing a con- 

 soluble, pro- siderable diminution of the temperature. The mean dimi- 

 ducing much nu ti n in my experiments was 9° of R. [20-25° F.], the 

 temperature of the atmosphere and of the substances em- 

 ployed heing 5° [43*25° F.]. The mixture of pure water 

 with the mother waters produced no change of the tern* 

 perature. 

 Mother waters As I had observed, that these mother waters became a 

 little fuming by evaporation, I tried the distillation of the 

 mother waters highly concentrated, and of the crystallized 

 muriate, to see whether 1 should not obtain a muriate of 

 tin similar to that known under the name of fuming liquor^ 

 of Libavius. Weak muriatic acid first came over; and then 

 the muriate either passed into the receiver, or sublimed into 

 the neck of the retort in a white mass, known formerly 

 under the name of butter of tin. With the same view I 

 Butter of tin. passed muriatic acid gas as dry as possible through the con- 

 centrated mother water of muriate of tin when it became 

 Fumin«liquor, fuming, and yielded crystals on mixing with it pure water. 

 weaker than g ut j must observe, that the fuming liquor of Libavius emita 

 that of Liba- . , . .i A •* • t. •. 



This. much more dense and copious vapours, that it is whiter, 



and that its specific gravity is greater. 

 The muriate The combinations of muriatic acid and tin in the state of 

 c^cess^acid) solution, of crystals, or of mother water, have always an excess 

 *nd variable, G f acid; and from what has been said it appears, that they 

 are all capable of infinite variations in their state. Hence 

 we need not be surprised, if the effects they produce in dye- 

 ing are so uncertain, and so different from one another. 

 The least variable state of muriate of tin appears to be that 

 ♦•xcept in crys of crystals perfectly white and thoroughly drained. In this 



uli, v.liich sute t i^ mor dant ought always to be employed in dyeing, 

 should altrtVh , ,. . c . . • , 



-rd for' adding to it a larger or smaller proportion ot nitric acid> 



t'i'^- according to the shade we wish to produce. Such a composi- 



tion alone can be always uniform, and yield constant results. 



Profiting 



