Saturday, May 17, 2014

The Unique Appeal Of A Verdigris Patina

By Minnie Whitley


A protective green pigment is formed on metals like bronze, brass or copper over time. This verdigris patina that forms after years of weathering is very different from the original gleaming copper color. Such a patina can be created today by using products that speed up the natural process. A wide range of such products are available from many local and online stores.

Burying is one of the oldest methods of creating patinas and some people still use variations of this method today. A technique used in the Middle Ages to speed up the oxidization process was to bury copper strips fastened to a wooden block in some dung for a few weeks. Objects buried in containers filled with an absorbent material like sawdust or kitty litter dampened with chemicals, can result in rich colors and textures.

Another method used in the past was to heat vinegar in pots over which copper plates had been suspended. Distilled wine in clay pots was also used to create this desirable green crust on copper plates. In Ancient Greece this green pigment was used by artists until more stable pigments were developed.

It is much easier to create such a finish today. There are many products on the market devoted to this purpose. These products enable a chemical reaction to take place, accelerating oxidation and creating special results. One can never predict exactly what the finished article will look like as various factors affect the outcome and this adds to the appeal.

Application must be done with care as is always the case when working with chemicals. Experimentation is usually part of the process and it is often exciting to see what results can be produced. As the process has so many variables, the end product is quite unique and this is why it is so appealing.

Some patinas are applied cold without any heat. These products are usually opaque and are applied in layers onto room temperature metals. Layers can be applied until one is happy with the resulting color. A small amount of the chemical can be decanted into a disposable container to avoid dipping the brush into the product container. Applying too much product can cause patinas to build up too fast making thick chalky areas that will flake off.

Products that need heat for application are often transparent. As heat is used the metal pores are opened, allowing the chemical to bond more tightly to the surface. More care needs to be taken, however, when working with hot metal and flammable chemicals. Gloves should be used as well as protective glasses. Ventilation is important when using any chemicals as fumes may be toxic.

This type of finish has become increasingly popular with homeowners as well as landscapers and designers. Statues, pots, doors, screens and many more items can be transformed, infusing interesting color and a touch of aged beauty into designs. They add the allure of something old and worn that has a history or tells a story.




About the Author:



No comments:

Post a Comment