Monday Morning Art School: more interesting greens

We take a snapshot of a dancing, glowing landscape and what we end up with is a wall of dull green. We need to insinuate that original energy back into our picture.

Bracken Fern, 9X12, oil on canvasboard, available, Carol L. Douglas

Michael Wilcox published a watercolor pigment guide called Blue and Yellow Don’t Make Green. (Don’t buy it unless you can get it for a few dollars; its information is widely available on the internet, including here.)

Of course blue and yellow make green, but there are many routes to the same destination. I ask my students to avoid greens out of the tube, because they’re a sure-fired way of ending up with a monochromatic ‘wall of green’.

Apple Tree with Swing, 16X20, oil on canvasboard, Carol L. Douglas

Instead, I ask them to mix their greens using a matrix. I’ve written about this many times, so I’m not going to repeat the concept, except to say that it’s critically important to avoid the soul-sucking deadness of greens out of a tube.

Impressionism changed the way we look at and mix color. From the beginning of painting, artists understood that to warm a color up, you add a warmer tone, and to cool a color down, you add a cooler tone. If that neutralizes the color, so be it. That’s in fact what happens in real life with real light.

The Impressionists started to treat color as a wheel. If you wanted a warmer, lighter green, you mixed it not with Naples yellow* but with its cadmium yellow neighbor. If you wanted a cooler, darker green, you mixed it with it not with black but with its Prussian blue neighbor.

Better yet, you didn’t mix them at all, but laid gold next to green to warm it up, and laid blue next to green to cool it down. These tiny, discrete spots of color are averaged by the human eye into a coherent image. A blizzard of brushstrokes and color resolves into a discernable truth.

Spring Greens, 8X10, oil on canvasboard, Carol L. Douglas

If you look carefully at human skin, you realize it’s not ‘skin-tone’ but is quite varied. There are areas tinged with blue, yellow, purple, and red. Without that, a person would look dead. The same is true of foliage. There are moments in which the color leans toward khaki, yellow, teal, violet and orange. They are what give life to greens.

Unfortunately, these color shifts are subtle and almost never caught in the snapshots we use as reference photos. We talk about ‘photographic proof’ as if it is an absolute, although by now we all know that photos are terrible liars.

For guiding a painting, photos have their limits. They distort distance and spatial relationships. Modern point-and-shoot cameras (especially cell phones) blow contrast and chroma up, because that’s what buyers like. In exchange, subtle value and hue shifts disappear.

We take a snapshot of a dancing, glowing landscape and what we end up with is a wall of dull green. Does that mean we can’t ever paint from photos? Of course not (although you’ll never really master the intricacies of natural color if you don’t go outside). It means we have to insinuate that energy back into the picture, and the tool we have to do that with is color.

The Impressionists taught us that we can do that by extending the range of color in an object. I can give you many examples of artists who did that, starting with Claude Monet and Vincent van Gogh. Spend a few hours analyzing their paintings in terms of color range.

I made a series of four photoshopped trees, above, to illustrate the concept. The first one is the normal way we might paint trees. With each step, I’ve added color range to the tree, until the final version has every position in the color wheel.

The guiding principle is the color of light. I’ve kept (for the most part) cool colors in the shadows and warm colors in the highlights. When you first try this, it will seem artificial and possibly absurd, but persevere. It’s the key to dynamic greens.

*Today’s Naples yellow is a mix and almost as deadening to a painting as sap green.

Monday Morning Art School: mixing greens

The rookie error for summer is to paint all foliage using the same basic color. You lose more points if it’s sap green.
Hazy mountain afternoon: Keuka Lake, by Carol L. Douglas. Available.
I have a student who reacts to my pulling out black paint by making the sounds of a rattlesnake at me. She’s been fully inculcated into the idea that black should be banned.
Michael Wilcox published a famous watercolor pigment guide called Blue and Yellow Don’t Make Green. Most of what it tells you can now be found on the internet, but it’s where I first got the idea to add back the banned black.
His point was that there are many routes to the same destination, and that to really mix colors, you need to understand what pigments you’re using, not work from trade names for colors. Consider sap green, for example—a staple of many plein air painters’ toolkit. It’s really a convenience mix made of a phthalo blue and some kind of yellow. The same is true of Hooker’s Green.
Chart courtesy of Victoria Brzustowicz
The single-pigment (‘true’) greens available are chromium oxide green, viridian, and cobalt green. Chromium oxide green is a lovely, heavy, natural green. Unfortunately, it outweighs everything it’s mixed with. Viridian and cobalt green are lovely, but expensive. Beware viridian hue—it’s just another phthalo in disguise.
By now, foliage has settled into a deeper, more uniform tone. The rookie error of August is to paint all your greens using the same basic color, modulating lighter or darker for highlights and shadows. You’ll have much more life in your trees if you know all the different ways you can get to leafy green. One of the most useful greens is black plus cadmium yellow lemon (or Hansa yellow).
Mixed greens, in oils.
The best way to navigate the colors of foliage is to avoid greens out of a tube altogether. A system of paired primaries gives you more options, avoiding the acidity of phthalo, the weight of chromium oxide green, or the soul-sucking darkness of sap green.
In my experience, bad paint mixing causes paintings to go wrong faster than anything else. Constantly over-daubing to modulate the paint color distorts the original drawing and makes a grey mush. If you’re confident of the color, you can apply it fast and accurately.
I make my greens on a matrix, which I’ve shown you both mixed (at top) and on a chart (below). I’m leaving for Castine Plein Air, but if I were teaching, I’d be drilling my students on green this week.
Swatches by Jennifer Johnson
First mix greens according to the chart, and then modulate your resulting greens with tints (meaning a mix of white and a color). The specific tints are unimportant, but the most useful one for landscape is a mix of white, ultramarine and quinacridone violet, making a pale lavender. It is great for atmospheric perspective.
Note that blue/black pigments are much stronger than the yellows. You need about half the amount of blue or black as you do yellow.
Your assignment is to hit paint swatches as closely as you can. 
The second exercise involves stopping at your local hardware store for a few paint swatches. These are Benjamin Moore brand, but you should be able to find similar ones elsewhere. There are two off-whites: one cool and one warm. There’s yellow, green, and two soft blues. Your assignment is to mix until you think you’ve hit the exact color. Then put a dot of it on the card to see how close you got. (If you’re working in watercolor, the dot goes on paper instead.)
Jennifer’s neutral swatches, up close.
I also have my students make neutrals using combinations of ultramarine blue with burnt sienna and raw sienna. I use ultramarine blue and burnt sienna as my standard dark-neutral, because it can go to the warm or cool side depending on how it is mixed. Raw sienna plus ultramarine is my go-to starting point for granite and the sands of our northern beaches.