793 DR. CHASE'S RECIPES. 



" For use, it is poured into a sheet zinc vessel, of suitable size and shape 

 for the objects or articles to be zinced, and about l-30th part of its weight of 

 finely powdered sal ammoniac is to be added. The articles are to be immersed 

 in this ("cold," as above mentioned), and a scum of fine bubbles forming on 

 their surface in from one to two minutes, indicates the completion of this part 

 of the operation. The articles are next drained so the excess may flow 

 back into the vessel. The iron articles are thus coated with a thin film of 

 zinc, and are to be placed on clean sheet-iron plates, heated from beneath, 

 until perfectly dry, and then dipped piece by piece, with tongs, or other 

 means, into very hot, though not glowing molten zinc, for a short time, 

 until they acquire the temperature of the melted zinc, into which they are 

 being dipped. They are then removed and beaten, or tapped lightly, to 

 cause any excess of zinc to fall off, while yet hot." 



Nickel Plating, Without Battery.— " To a dilute solution of the 

 chloride of zinc— 5 to 10 per cent.— (5 to 10 lbs. to 100 lbs. of water)— enough 

 sulphate of nickel is to be added to give the solution a decidedly green 

 color, and it is then to be heated to boiling in a porcelain vessel. The 

 heating makes the solution cloudy, but does not injure it. The articles to be 

 nickel plated are to be carefully cleaned of rust or grease, (see 1st receipt 

 above for cleaning brass), and then suspended in the solution from 30 to 60 

 minutes, the bath being kept at a boiling temperature. When the articles are 

 observed to be imiformly coated, they may be removed, washed in water; 

 in which a little chalk is suspended, dried, and finally polished with chalk, 

 or other suitable material." 



Remarks. — This discovery is credited to a Prof. Slatba, and will be 

 found valuable. Precipitated chalk is very fine, but rotten stone, as in 

 some of the above receipts for polishing brass may be found preferable. 

 2iincing is done mostly on small cast-iron articles, while this nickel-plating 

 is used on a finer class of goods. 



Silver Plating, With a Battery.— 1. Dissolve 1 oz. of pure silver 

 <like old coin) in nitric acid, by pomlng the acid upon the silver until all is 

 dissolved— perhaps 4 ozs. of acid to cut 1 of silver— then dissolve salt in soft 

 water until very strong; now pour of this salt water into the acid and silver 

 until all the silver sinks to the bottom, scientists say, until all is "thrown 

 down;" then fill the jar or bottle with soft water, shake up, and let settle; 

 then pour off carefully, and fill again and again, for three times, siiaking welj 

 each time, or until there is no acid or taste of acid left. This, if carefully 

 done, without waste, gives you 1 oz. of silver in fine powder. 



3. In a suitable jar or dish, dissolve cyanide of potassium, 6 ozs. in soft 

 rain water, 3 qts., into which put the silver powder, which will be dissolved 

 therein, and this constitutes the plating solution. 



3. In this solution the articles to be plated are to be suspended upon a 

 silver hook. And in this solution must also be suspended a plate (generaUy in 

 sheet form) or piece of pure silver, with about as much surface as there is 

 surface to the articles to be plated, as it is necessary to keep the strength of 



