Interference is real

Please note: This blog post has nothing to do with the U.S. 2016 presidential election nor the 2018 Saints – Rams NFL division championship. It has to do with interference of light waves, and how this is seen in art and nature. Have I lost you yet? Do read on…

@Elizabeth Busey. Aqua Pura. Monoprint collage, 18 x 18in.

Reflectivity is a 2D artist’s attempt at dimension

In many of my monoprints, I include some tiny bits of gold leaf. In Aqua Pura, I didn’t feel like it needed gold’s warm tones, but it did need something reflective. Why did I think this? I was not an overly feminine child and own very little bling as an adult. My only thought is that some reflectivity of light on a 2D work makes it feel less flat. Perhaps there is a 3D artist hiding inside. I’m hoping to let her out later this summer at another Penland workshop… (more about that later.)

Painting Guerra Paint & Pigment Co.’s Interference Blue is the last step.

Interference pigment is magical

I’ve had some interference pigment for a few years. I had intended to make my own encaustic printmaking sticks, and that hasn’t happened — yet. Usually this pigment is added to a binder or to another paint. I used mine straight out of the container, binding it to the paper with gold leaf sizing. I just let the sizing dry for an hour as usual, and then gently painted on the pigment over the sizing areas.

Artists Network explains: “These pigments are not particles but flakes of mica, usually coated with a microscopically thin layer of titanium dioxide pigment.” It is incredibly fine, so I am careful to put it on gently, and brush it off the work out of doors. I painted mine over white paper (with white sizing) so the result is that at one angle it looks like a soft white, and at another angle it is a brilliant cobalt blue.

You can see the interference pigment at work in the dark blue section of the collage.

Interference in nature

Interference is one of the ways color is created in nature. (See this fascinating article to read about all three ways and get a more in depth explanation of interference.) You see this phenomenon in oil slicks on water and colored light on bubbles. The changing of color is what makes it interference — either the light waves are reinforced (the color is very strong) or destroyed (you see white in my work.)

A related phenomenon is iridescence, which means that many colors are shown. I may need to work this into my repertoire as well.

You can see gold leaf and interference pigments at my studio as part of Bloomington Open Studios Tour. Saturday, June 8th (10-6) and Sunday, June 9th (10-4).

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