The Art of Electro-plating and Gilding. 



341 



and experience of the operator may dictate. It is especially 

 useful when cleansing by. means of sand and brush, to mix a 

 little pulverized chalk with the sand, and to moisten it with 

 hydrochloric acid ; but a final scrubbing with the clean brush 

 would in that case be necessary. 



Fiql 



JPw 2 



After the final cleansing, the object should be instantly 

 immersed in the plating solution, and the manner of preparing 

 this next claims our attention. 



Several such solutions have been recommended by different 

 chemists ; of these, there is one more in favour than any other, 

 and this alone I shall at present describe. It is that which I 

 have used in making a great number of experiments, and is 



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