To make 250 ml

Make a mark at the 250 ml volume level on your container

Fill container with about 100 ml water

Add copper sulphate 5 g (koper (II) sulfaat)

Add copper acetate 5 g (koperacetaat)

Add potassium aluminium sulphate 5 g (kaliumaluminiumsulfaat)

Add water to 250 ml mark

For this project we chose eight different ways to apply the patination solutions to our rings, and each different method of application caused a radically different patina. Other methods of patination are possible, and we encourage you to try different techniques! The ninth piece of every set of rings has not been patinated, this shows the casting skin.

Be aware that everything in the world is made of “chemicals”, and that the tools you use to apply your patination solution can take part in your patination reaction, and change the patina. Use a non-reactive borosilicate glass as a container when working with heat or acids. Avoid using plastics when using heat. For brushing applications, use an inexpensive paintbrush made of natural fibres, such as a hog hair brush.

The specific notes on the application of this patina recipe are in Italic.

A

Applied on the untreated casting skin surface: repeated brush applications of the patination solution on bronze heated with a blow torch. This patina requires high heat and repeated application. Reaction is slow to start, but once it does it develops quickly. Continued heating can burn the patina.

B

Applied on a sandblasted surface: repeated brush applications of the patination solution on bronze heated with a blow torch. This patina requires high heat and repeated application. Reaction is slow to start, but once it does it develops quickly. Continued heating can burn the patina.

C

Applied on a sandblasted surface: repeated brush applications of two different patina solutions on bronze heated with a blow torch. Application of this patina solution, followed with a cupric nitrate solution for verdigris patina (25 g of copper (II) nitrate (KOPER (II) NITRAAT) in 250 ml of water). Cupric nitrate solution should be used sparingly as it overwhelms other patinas.

D

Applied on a sandblasted surface: repeated brush applications over the course of ten days on room temperature bronze. Moderate effect when applied at room temperature. Let patination solution pool on the surface to form a verdigris sheen patina.

E

Applied on a sandblasted surface: boiling of the bronze in a heated patination solution. Results are streaky, needs multiple applications for a more even olive colouring.

F

Applied on a sandblasted surface: buried in wood chips soaked in patination solution for a week. Forms variations in the gloss of the different coloured patches.

G

Applied on a sandblasted surface: single dip of bronze heated with a blow torch in heated patination solution. Surface changes as it is dipped, reaction difficult to control.

H

Applied on a sandblasted surface: held in the vapour of a heated patination solution. More development of patina in areas held closer to the boiling liquid.