Note J — Chapter VI
Reading edition
4 grm. cryst. cupric sulphate are dissolved in 20 c.c. of water; and 16 grm. of neutral potassic tartrate and 13 grm. of fused sodic hydrate are dissolved in 60 c.c. The two are mixed, made up to 100 c.c., and boiled for some minutes. It should always be tested before use by boiling a portion, which should remain perfectly clear.