Monday, December 8, 2014

Geraniaceae Seeds

I have a hard time deciding whether to call these pictures drawings or paintings, but it was an fun experiment, no matter the name. I transferred pencil drawings from photos that I took, painted in the background, shaded in the pencils drawings, painted over the drawings with thin washes of acrylic inks, and then scratched out highlights with a knife. I worked back and forth between the pencil and ink and scratching out whites, Claybord* is great for that because the surface is smooth and deep enough that it can be scratched off a few times without scratching through.

Geranium Seed #1,  pencil and acrylic ink on Claybord, 8x8 inches, 12/2013.


On two of the pictures (#1 and#3) I used multiple layers of acrylic ink to fill in the background, which worked pretty well, it just took a few layers to get even coverage. For #2 I tried acrylic paint, and it wasn't as easy to work with as the ink, it chipped in places when I scratched out the details. The paint also left lines that had to be smoothed carefully, so I'll probably stick with ink in the future.

Geranium Seed #2,  pencil with acrylic ink and paint on Claybord, 8x8 inches, 12/2013
The shine of the pictures made them hard to photograph, I tried several times and had no luck, even going all out and building a black light box didn't help.  Then I realized that I could scan anything small enough to fit on the scanner bed, so I tried it and had great luck.

Geranium Seed #3,  pencil and acrylic ink on Claybord, 8x8 inches,  4/2014.
The seeds are something in the Geraniaceae family, I'm not sure exactly what species because I didn't take pictures of the plants themselves. The seeds were stuck in my socks after hiking at one of the local parks, so I brought them home and took some pictures to work from. They're common Texas wildflowers found near San Antonio, Texas.  The seeds in this family spring out as they dry, launch away, and stab into to things to get themselves dispersed. The amazing thing that I found out when trying to identify them is that the coil changes with the humidity, getting longer when wet and shorter as it dries, and will screw the seed into the ground.

  
I did a little experiment by tracing a dry seed on a piece of paper, soaking it on water and seeing if it expanded any. Turns out that it did expand, after a few minutes, and within half an hour it was back to the original shape. 
Geranium Seed #1,  detail.
Geranium Seed #3, detail. 
Geranium Seed #3, detail.
For more information on the way the seeds explode out and bury themselves, see this paper:
Evangelista D; Hotton S; Dumais J. 2011. The mechanics of explosive dispersal and self-burial in the seeds of the filaree, Erodium cicutarium (Geraniaceae). Journal of Experimental Biology. 214: 521-529. 

*I am not compensated in any way by Ampersand, I just love their products. 

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