[ m } 



then put on your A<iua fortis a fécond time, and 

 let it lie about half an hour. It may be taken 

 off, and put on again, if the cafe requires-, 

 and you may flop other parts that you 

 would not have very dark -, but remember to 

 wafli and dry your plate every time you ftop 

 with the varnifli. Few of my plates have had 

 the Aqua fortis on them lefs than half an hour 

 on the lighter parts, or more than a hour and an 

 half on the darker parts. "When the plate is 

 \i\t in as deep as you woijld have it, wafli the 

 Aqua fortis well off from it ; then fcrew your 

 hand- vice on the edge of it, and hold its wrong 

 fide a while before, or over a fire, and the wax 

 border will flip off ; then take a little olive, or 

 any oil, put it on the hot plate, and rub it over 

 with a rag, then wipe the plate clean, and you 

 will fee your defign very plain. The plate is 

 then fit to fend to the rolling-prefs for a proof, 

 after which, any common hand may put in a 

 few ftrokcs with a graver, in cafe there be found 

 any little déficiences. 



Thus have I given as niuch, and no more, 

 m the fubjeft of etching, than I have difcovered 



from^ 



