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Recipe 5

Instructions

To make 250 ml

Use an inert borosilicate glass (borosilica glas) container to store this solution
Make a mark at the 250 ml volume level on your container 
Fill container with about 100 ml water  
Add ammonium persulphate 5 g (ammoniumpersulfaat)
Add sodium hydroxide 15 g (natriumhydroxide)
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. Only low heat is necessary to develop the patina.

B

Applied on a sandblasted surface: repeated brush applications of the patination solution on bronze heated with a blow torch. Only low heat is necessary to develop 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, but here the underlying patina greatly muted the verdigris colour.

D

Applied on a sandblasted surface: repeated brush applications over the course of ten days on room temperature bronze. Resulted in a blue crust, which rinses off with water to reveal a milder patina.

E

Applied on a sandblasted surface: boiling of the bronze in a heated patination solution. Due to the selective evaporation of ammonium persulphate a few grains need to be added to the solution every minute.

F

Applied on a sandblasted surface: buried in wood chips soaked in patination solution for a week. There was no visible development of a patina.

G

Applied on a sandblasted surface: single dip of bronze heated with a blow torch in heated patination solution. Resulted in an even patina.

H

Applied on a sandblasted surface: held in the vapour of a heated patination solution. Patina formed in droplet shapes.

I

The untreated casting skin surface: no patination.

Results

Ring 5-A
Ring 5-A magnification 50×
Ring 5-B
Ring 5-B magnification 50×
Ring 5-C
Ring 5-C magnification 50×
Ring 5-D
Ring 5-D magnification 50×
Ring 5-E
Ring 5-E magnification 50×
Ring 5-F
Ring 5-F magnification 50×
Ring 5-G
Ring 5-G magnification 50×
Ring 5-H
Ring 5-H magnification 50×
Ring 5-I
Ring 5-I magnification 50×
Recipe 6
Recipe 4
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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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