144 
Glazed Copper. 
without touching the coals, till the brass is melted : or 
fuse with a blow pipe. 
I do not recollect at present, any further communication 
of consequence on the subject of Copper , except the fob 
lowing. 
Glazed Copper and Iron Vessels — A Mr. Hicklin 
some years ago obtained a patent for glazing iron and cop- 
per kitchen utensils ; this can be done either with the com- 
mon composition for Queen’s ware (the common yellow- 
ish white pottery) or with the other receipts given by 
Mr. Hicklin, which I give as under : the queen’s ware is 
composed of 3 parts by weight of good clay well ground, 
and washed, and one part of burnt flint in fine powder ; 
it is glazed with a composition consisting of 1(X > parts 
white lead, 25 parts ground flint, and 5 parts ground 
flint glass, which contains about one fifth of lead. 
Hicklin’s compositions are these : 6 parts calcined 
flint, 2 parts white granite, 9 parts litharge, 6 parts borax, 
1 part clay, 1 part nitre, 6 parts calx (oxyd) of tin, 1 
part potash. 
In this, the white; granite, probably means the decom- 
posed feldtspar of the granite, such as abounds near Phi- 
ladelphia and Baltimore : some of the other fluxing ingre- 
dients might be omitted, as the potash for instance, but 
they are not very expensive. 
Or, 8 parts calcined flint, 8 parts red lead, 6 parts 
borax, 5 parts calx of tin, 1 part nitre. 
Or, 12 parts white granite, 8 parts borax, 10 parts 
white lead, 2 parts nitre, 1 part of white marble lime, 1 
part clay, 2 parts pearl ash, 5 parts calx of tin. 
Or, 4 parts Calcined flint, 1 part white granite, 2 parts 
nitre, 8 parts borax, 1 part white marble calcined (that is, 
lime), half a part clay, 2 parts calx of tin. 
(The calx of tin is made by calcining in with heat ex- 
posed to the air ; by fusing it with nitre, or by precipi- 
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