Indelible Ink For Marking Linen
Add Caustic Alkali to a saturated
solution of Corpous Chloride until no further precipitate forms; allow
the precipitate to settle, draw off the supernatant liquid with a
siphon and dissolve the hydrated copper oxide in the smallest quantity
of Ammonia. It may be mixed with about 6 per cent of Gum Dextrine for
use.