※ Additional NaCN (0.4-0.7 g /ℓ) is needed for every 8-operating house.
Ammonium Hydroxide, 28%(0.1-0.3 mℓ/ℓ at 30°C or 0.3-0.5 mℓ /ℓ at 45°C) should
added every day.
New Brass Salt gives an enhanced and stable color. Also, it is easy to maintain
the Brass Salt bath.