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in fomc very thin filk, or farfenet, to keep the 

 dreggy parts from getting through; then pafs 

 it over your plate, in all parts, that the plate 

 may be wholly covered ; then take a little wad 

 of cotton, tied up in a thin piece of filk^ and 

 pafs it all over your plate, to fpread your var- 

 niOi even. When it is fo fpread, let the plate 

 gradually cool, and while it is cooling dab it all 

 over with your cotton puff, and it will lay your 

 Ground ftill fmoother, and with a finer grain, 

 or rather fhew no grain at all. When you have fo 

 fpread your varnifli on the plate, have ready a 

 very large candle, and hold the varniflied fide 

 of the plate over the candle, moving it back- 

 wards and forwards, till it be of a good black 

 in every part, but be careful the fnuff do not 

 touch the plate : after which lay it to cool, 

 and it is fit to work upon. 



Care muft be taken in heating your plate, for 

 if your fire be too fierce, your plate will turn of 

 a bluifli colour : if you perceive any fuch change 

 on your plate, it muft be cleanfed bright, and 

 heated again, for fuch burnt places will not hold 

 the Ground when the Agua fortis is laid on, 

 M 2 When 



