By Constance K Bassett
P.A. Fiebiger, Inc.
462 Tenth Avenue
New York, NY 10018
Application procedure for developing various antique green patinas:
The copper sheeting surface with a dilute or form is solution of:
nitric acid – 1 part
distilled water - 25 parts
or by lightly bead or sand blasting.
The copper is washed with a dilute solution of:
ammonium sulfide 1 part
distilled water 10 parts
darkening the metal to an even shade of brown-black. The metal is rinsed with distilled water, neutralizing the chemical. The copper is allowed to dry. The surface is now prepared for the green patination.
I. Plaques 1 - 4
These plaques were washed successively with a solution - of:
ammonium chloride –1 part
distilled water -17 parts
The surface was allowed to dry between coats
II. Plaques 5 - 8
These plaques were washed successively with a solution of:
cupric nitrate -1 part
ammonium chloride -1 part
calcium chloride -1 part
distilled water -17 parts
The surface was allowed to dry between coats. When a light green was achieved, the patina was finished with -successive coats of Solution I (plaques 5-7). Plaque 8 was washed repeatedly with Solution II, only.
III. Plaques 9 - 10
These plaques were washed successively with a solution of:
cupric nitrate -2 parts
ammonium sulfide -1 part
calcium chloride -5 parts
distilled water -17 parts
The surface was allowed to dry between coats. When a blue-green was achieved, the patina was finished with several coats of Solution I.
IV. Plaques 11 14
These- plaques were washed successively with a of:
cupric chloride -1 part
ammonium chloride -1 part
distilled water - 34 parts
The surface was allowed to dry between coats.
Prepared by: Constance K Bassett