I’m often surprised at the colors I end up with when making paints. Sometimes the rock powder looks a lot different than the rock itself led me to think it would. But today I found a new puzzle. I usually use sandstones to get pigments, and this one black sandstone has always been a bit of a mystery. The first time I saw it, the thought that it isn’t sandstone did run through my mind. Other possibilities include bituminous coal.
At first glance it does look like sandstone. But get it cracked open and look with a magnifying glass … and there’s shiny black flakes and bits inside. Once I grind it up, it feels gritty enough like a sandstone, though. For lack of any other rock-type description that matched it, I decided to just call it ‘sandstone’ until I learned differently. Perhaps that day is today.
I used to use it to make a nice earthy brown color. But that was before I’d tried washing it. I had never washed and separated it before, just crushed and mulled. It is one of the hardest rocks I’ve ever crushed. However, after mulling it for a little while, the grittiness seemed to magically disappear, as though it all dissolved suddenly in the binder. It has been one of the greatest rock source mysteries I’ve found in my paint-making adventure.
Recently I crushed a good sized chunk of this rock with the glossy bits and decided to try washing the pigment to see if it changes the color. Well, it did. Not only that, the lites aren’t behaving the way sandstone lites do. Lites are the part of the rock powder that stays suspended for a while when I wash it. When they settle out, I pour off the water and use them to make a nice, smooth paint. These lites are tarry and doesn’t appear to be drying out even in the dehydrator.
So maybe this isn’t sandstone, after all. Maybe those glossy bits are bitumen – bituminous coal.
I didn’t get a brown color from the heavies, I got black. Which is nice, because sometimes the shale isn’t black enough, and bone is not always available. But what about the brown? I actually needed that color, and all of the other stone sources have a reddish tint to them that I don’t always want.
Whole, ground rock 
Washing the pigment 
Getting ready to mull
The tarry stuff might be useless… I’m not sure. (Update: the tarry stuff eventually dried and produced the nicest black paint I’ve made to date! Better than the bone, with a slight gloss. Bone black is very matte.)
ABOUT
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Roxann Riedel is a salesperson for Montgomery Whiteley Realty, artist, owner of the only ginseng nursery in Arkansas, and the author of books and this website. Madison Woods is the pen-name she uses for her creative works. She’s a self-taught artist who moved to the Ozarks from south Louisiana in 2005. Her paintings of the Ozark-inspired scenes feature lightfast pigments from Madison county, Arkansas. Her inspiration is nature – the beauty, and the inherent cycle of life and death, destruction and regeneration. Wild Ozark is also the only licensed ginseng nursery in Arkansas. Here’s the link for more information on the nursery
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Contact Mad Rox: (479) 409-3429 or madison@madisonwoods and let me know which hat I need to put on 🙂 Madison for art, Roxann for real estate, lol. Or call me Mad Rox and have them both covered!
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