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Method of deteEling Lead by Cheynical Tiefl. 



To point out a certain method of detedling the 

 poifon of lead, in whatever form it may be found 

 lurking, next demands our confideration. This 

 happily is pradlicable^ but the principle on which 

 it depends cannot be clearly underftood but by 

 thofe who ape tolerably verfed in chemiftry. The 

 fact, however, is highly interefting to the publick, 

 and therefore ought to be univerfally known. In 

 whatever lubftance, then, this infidious enemy may 

 lie in ambufh, whether in wine, cyder, foods, me- 

 dicines, or cofmeticks, the following teft, like the 

 touch of IthurieVs fpear, inftantly brings the culprit 

 to light. 



Take of yellow orpiment in powder i ounce, 



of quick-lime frefti from the kiln.... 2 ounces, 



« of diftilled water boiling hot 20 ounces. 



Let the whole ftand twenty-four hours in a clofe veffel of 

 glafs or porcelain, ftirring the mixture with a wooden fpa- 

 tula. Then carefully decant the clear liquor, and ftrain it 

 into a bottle, which muft be well fecured and kept for ufe. 

 Frequent expofure to air, deflroys its tranfparency. 



Remarks. 



ift. Ifa few drops of this liquor be put into 

 a glafs of wine or other fufpedled liquor, and no 



chang« 



