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Category: warm vs cool

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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.
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Monday Morning Art School: Add back the banned black

A color exercise that can be done with anything from a dime-store watercolor kit to a professional palette.
The Servant, by Carol L. Douglas
Back before black was banned from the palette, we had shades and tints. Shades are made by adding black to a pure color. Tints are an admixture of white to a pure color. Shades aren’t an effective way to make something darker, but they often make nice new hues.
What we consider acceptable in color-mixing is style-driven, just like everything else. For example, see the Permanent Pigments Practical Color Mixing Guide of 1954, below. It’s all about making shades and tints. That’s a hint about why mid-century paintings looked so grey. A little shading goes a long way.
A mid-century guide to mixing colors.
Today’s exercise is to make a paint chart playing the warm tones on your palette against the cool tones. Both of these examples were done in class by students. My definition of warm vs. cool has shifted over time. Ten years ago, I included quinacridone violet among the cools; last month I had my student stick it in among the warms. That’s because warm-vs.-cool is an arbitrary designation.
The chart in watercolors.

The instructions are a little different for solid-media students than for watercolorists. In either case, start by marking off your paper or canvas with 1” squares, allowing enough room for the cool colors on the left and the warm colors across the top.

Watercolorists (and users of fluid acrylics) just need to mix the colors. Oil painters need to tint their colors with a little bit of white. I’ll get to that below.
In watercolor, the column on the far left should be pure pigments straight from the tube: blues, greens, black, and violets if you want to call them cool. The row across the very top should also be pure pigments, but in the warm tones: reds, oranges and yellows.
The boxes in the middle of the chart are all mixtures. For example, the second-row-second-column box on Sheryl’s chart is black+raw umber. The third-row-second-column box is ultramarine blue+raw umber. The bottom right box is sap green+quinacridone violet, and so on.
The greatest difficulty for watercolor painters is to try and keep the color balance equal. Pigments differ in density, and it’s hard to control dilution. Still, try to use the same amount of each in your mixtures.
Sheryl was doing something my friend Poppy Balser calls “licking the paper.” (That’s partly because she was using a very cheap paper.) That means she was fussing after she put the first brushstroke down. That gave her final chart a mottled appearance. Try to get the mixture down in one brushstroke and leave it.
The chart in oils.
Solid media (oil, gouache, and acrylic) painters have a slightly different assignment. They need to add white to their mixtures. I always add it on the cool side of the chart, by mixing a large clump of the cool-plus-white colors and using that to work across, modulating the warm colors. Working this way, your second-row-second-column box will be (black+white)+raw umber. The third-row-second-column box will be (ultramarine blue+white)+raw umber, and so on.
Note that there is one three-way mixture on the left column. I do not typically paint with a tubed violet, so row five started with a mixed violet to which I added white. If you use a dioxazine purple, it belongs here.
Your last task for this week is to use color temperature, rather than value (lightness or darkness) to define the volume of a sphere, as in Sheryl’s example, below. Her shadows are warm, and her light is cool. Experiment with reversing that as well.
The shape of this sphere isn’t defined with value (lightness or darkness) but with a shift in color temperature. Try it!

This blog post was originally published on November 13, 2017. I’m traveling today.

Posted on

Monday Morning Art School: Add back the banned black

A color exercise that can be done with anything from a dime-store watercolor kit to a professional palette.

Back before black was banned from the palette, we had shades and tints. Shades are made by adding black to a pure color. Tints are an admixture of white to a pure color. Shades aren’t an effective way to make something darker, but they often make nice new hues.
What we consider acceptable in color-mixing is style-driven, just like everything else. For example, see the Permanent Pigments Practical Color Mixing Guide of 1954, below. It’s all about making shades and tints. That’s a hint about why mid-century paintings looked so grey. A little shading goes a long way.
A mid-century guide to mixing colors.
Today’s exercise is to make a paint chart playing the warm tones on your palette against the cool tones. Both of these examples were done in class by students. My definition of warm vs. cool has shifted over time. Ten years ago, I included quinacridone violet among the cools; last month I had my student stick it in among the warms. That’s because warm-vs.-cool is an arbitrary designation.
The chart in watercolors.

The instructions are a little different for solid-media students than for watercolorists. In either case, start by marking off your paper or canvas with 1” squares, allowing enough room for the cool colors on the left and the warm colors across the top.

Watercolorists (and users of fluid acrylics) just need to mix the colors. Oil painters need to tint their colors with a little bit of white. I’ll get to that below.
In watercolor, the column on the far left should be pure pigments straight from the tube: blues, greens, black, and violets if you want to call them cool. The row across the very top should also be pure pigments, but in the warm tones: reds, oranges and yellows.
The boxes in the middle of the chart are all mixtures. For example, the second-row-second-column box on Sheryl’s chart is black+raw umber. The third-row-second-column box is ultramarine blue+raw umber. The bottom right box is sap green+quinacridone violet, and so on.
The greatest difficulty for watercolor painters is to try and keep the color balance equal. Pigments differ in density, and it’s hard to control dilution. Still, try to use the same amount of each in your mixtures.
Sheryl was doing something my friend Poppy Balser calls “licking the paper.” (That’s partly because she was using a very cheap paper.) That means she was fussing after she put the first brushstroke down. That gave her final chart a mottled appearance. Try to get the mixture down in one brushstroke and leave it.
The chart in oils.
Solid media (oil, gouache, and acrylic) painters have a slightly different assignment. They need to add white to their mixtures. I always add it on the cool side of the chart, by mixing a large clump of the cool-plus-white colors and using that to work across, modulating the warm colors. Working this way, your second-row-second-column box will be (black+white)+raw umber. The third-row-second-column box will be (ultramarine blue+white)+raw umber, and so on.
Note that there is one three-way mixture on the left column. I do not typically paint with a tubed violet, so row five started with a mixed violet to which I added white. If you use a dioxazine purple, it belongs here.
The chart above was designed for figure painting, but applies everywhere. It easily adapts for differences in skin color. Figure commission by Carol L. Douglas
Your last task for this week is to use color temperature, rather than value (lightness or darkness) to define the volume of a sphere, as in Sheryl’s example, below. Her shadows are warm, and her light is cool. Experiment with reversing that as well.
The shape of this sphere isn’t defined with value (lightness or darkness) but with a shift in color temperature. Try it!