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Recipe 7

Instructions

To make 250 ml

Make a mark at the 250 ml volume level on your container
Fill container with about 100 ml water
Add silver nitrate 5 g (zilvernitraat)
Add water to 250 ml

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.

Application

A

Applied on the untreated casting skin surface: repeated brush applications of the patination solution on bronze heated with a blow torch. Application at low heat gives an immediate effect, continued heating may burn the patina.

B

Applied on a sandblasted surface: repeated brush applications of the patination solution on bronze heated with a blow torch. Application at low heat gives an immediate effect, continued heating may 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 in 250 ml of water). Cupric nitrate solution should be used sparingly as it overwhelms other patinas. The heating required to develop the cupric nitrate patina darkened the silver patina.

D

Applied on a sandblasted surface: repeated brush applications over the course of ten days on room temperature bronze. Patina easily forms evenly over the surface. Repeated applications give added sheen.

E

Applied on a sandblasted surface: boiling of the bronze in a heated patination solution. Resulted in an extremely even patina.

F

Applied on a sandblasted surface: buried in wood chips soaked in patination solution for a week. Development of a textured metallic patina.

G

Applied on a sandblasted surface: single dip of bronze heated with a blow torch in heated patination solution. Darkened the silver patina.

H

Applied on a sandblasted surface: held in the vapour of a heated patination solution. Resulted in a metallic patina.

I

The untreated casting skin surface: no patination.

These patinas are not light-fast. A UV-resistant lacquer can be used to keep the patinas from darkening.

Results

Ring 7-A
Ring 7-A magnification 50×
Ring 7-B
Ring 7-B magnification 50×
Ring 7-C
Ring 7-C magnification 50×
Ring 7-D
Ring 7-D magnification 50×
Ring 7-E
Ring 7-E magnification 50×
Ring 7-F
Ring 7-F magnification 50×
Ring 7-G
Ring 7-G magnification 50×
Ring 7-H
Ring 7-H magnification 50×
Ring 7-I
Ring 7-I magnification 50×
Recipe 8
Recipe 6
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MEZZOTINT WORKSHOP

On 16, 23 and 24 May 2024 we organize a 3-day workshop Mezzotint, an intaglio printing technique, under the guidance of Sjoerd Tegelaers. Register via make@makeeindhoven.nl.

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