132 ANDREAS KURTZ 



More fully he gives the cost of other 

 mixtures : 



Swedish best ore, 800 Ibs. @ 72;- 

 Pure potash liquor. 4, 500 Ibs. @ ioo/- 



Lime pure 450 Ibs. @ 6/- 



Old Mixture 250 Ibs. 



Nitre 28 Ibs. @ 8/- 



Labour and coals 40;- 



Unforseen 247 



250;- 



This should produce 500 Ibs. of chrom, 

 but in my large way I only get 400 Ibs. net. 



Cost prime about 8d. per Tb." 



From the manufacture of bichromate, he 

 turns to the preparation of colours in which 

 bichrome is used : 



" 308 Ibs. of prussiate, 230 Ibs. copperas, 

 2olbs. tin solution, 154 bichromate, 100 pails 

 of nitrate of lead 20 to 24, and 10 pails of 

 zinc. This has produced a very fine dark 

 green, like the same from the Dutch. Mine 

 is rather better to 6,000 Ibs. of baryta." 



" For light yellow green, as sample from 

 the Dutch, 150 Ibs. prussiate, 115 Ibs. 

 copperas, 10 tin, 300 bichrome, 200 pails 

 nitrate of lead at 20 ; 20 pails of zinc solution 

 to 6,000 baryta." 



