116 
Brass. 
Another durable , though somewhat expensive , Method 
of Tinning. 
This tinning, which consists of more articles and is 
dearer than the former, can be applied to metals and me- 
tallic mixtures, and, when well prepared, is exceedingly 
durable ; which makes up, in some measure, for the cost. 
It is as follows,— Take pure grained tin one pound, good 
malleable iron one ounce and a half, platina one dram, 
silver twenty-four grains, and gold three grains. These 
five metals must be well fused together in a crucible with 
one ounce of pounded borax and two ounces of pounded 
glass, and the liquid matter must be formed into small 
ingots. These ingots are to be again heated and redu- 
ced to powder in a warm mortar with a hot pestle. This 
powder is then to be put in an iron pan over the fire, 
where it must be again fused, stirring it well round : it is 
then to be poured into small flat moulds, where it is suf- 
fered to cool, and it is then fit for use, 
This tinning is to be applied in the following manner. 
First tin the vessel with grained tin and sal ammoniac in 
the common manner ; clean and scower this- coating ; 
then apply the composition with sal ammoniac according 
to the usual process, and when it is well diffused suffer 
the vessel and the tinning to cook Then expose it every 
where to a gentle heat to render the adhesion stronger* 
and immerse it while hot into cold water to give it that 
hardness and solidity which it had lost by being heated* 
The surface is somewhat rough and gritty : but you then 
rub it hard with a scratch-brush ; and, in order to make 
it even, you afterwards smooth it completely with fine sand 
or any polishing ingredient. 
If one coating does not appear sufficient, a second, and 
even a third, may be applied in the manner above de- 
scribed. Two coatings, however, are fully sufficient for 
kitchen utensils which have been a good deal used $ and 
