I took a thin slice of agate, mounted it and lit a cone of incense behind it... Then turned all lights off and captured this photo.
Photoshop process: Shadow/highlight 5%/20%
Levels 7/0.69/199
Brightness/contrast -8/+29
Hue/Saturation +7/+32/-10
Obviously cropped, resized and sharpened before saved for web.
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