[ i68 ] 



or miflake is committed, and when dry may be 

 worked over again to redlify a miftake. The 

 piece fbould be thoroughly examined, and all 

 omifiions reélified, before the Aqua fortis is ap- 

 plied to the plate. 



A foft Wâx for bordering the Plate to keep on (be 

 Aqua fortis. 



Take white rofin and bees- wax in equal parts, 

 incorporate them together over a fire in a pip- 

 kin, and make the mixture into a roll for ule. 

 If it be found too hard to be worked and knead- 

 ed with your hands in winter, it may be brought 

 to a greater or lefs degree of foftnefs, by melting 

 it again, with a lefs or greater proportion of 

 olive oil. 



"When your plate and the wax are ready, take 

 a piece of the vv^ax, wet your hands, and roll the 

 wax out in length like a cord, fufficient to go 

 round the borders of your plate -, then lay your 

 plate in an horizontal pofition, where it may lie 

 firm 5 then fix your wax on its edges very clofe^ 

 that the Aqua fortis may not pafs between thç 



wajç 



