To me, the idea of painting with cadmium colours is kind of like drinking coffee- that is not a perfect analogy because they are poisonous and definitely don’t grow on trees. I mean they have been an automatic habit of mine that I fell into at an early age because I thought it was the right thing to do; and over time, like those morning, afternoon, and evening cups of coffee, replacing used up tubes of cadmium red and cadmium yellow acrylic paint with more of the same was not a decision, it was just what I did, on account of having been told in art school that cadmium is best. I have purchased other types of cool red and magenta paint over the years for mixing purples, but when it comes to mixing hues in the warm red to orange range, you need cadmium red light, don’t you? Or do you, really?

This is an unfinished painting that I have been working on of boats on the Yukon River, before freezeup time. It is based on a photograph I took last October. Within a week or less the boats would not be able to leave the shore, because the ice flows would be growing on the river. In fact I noticed that canoe and rowboat are still there, though barely visible covered in deep snow.
Now I want to talk about the colours I used in this painting, because perhaps my process may help others who have run into similar colour mixing issues. I will get fairly detailed, so readers who don’t paint might want to skim down to the ending paragraphs, where I offer my insight into the world of caffeinated beverages…
I started with a neutral underpainting using burnt umber, phthalo blue and ultramarine blue for my mixed black, plus titanium white.
Then, I started to paint the sky using cadmium red, mixed with hansa orange, as well as other pigments for the blue, grey and purplish tones, including ultramarine blue and quinacridone violet. In some brush strokes I blended my red based mix with my blue to purple mix in an effort to create softer variations of the brighter areas.
I took a picture of my painting (not the picture above, this was an earlier stage) and posted it on my Facebook page. It looked great, because the glow from the camera flash somehow made the red pop out. Actually, in real life, I thought there were a lot of muddy, gross tones in the sky. Where it was supposed to be soft, it looked earthy, and who wants earth tones in the sky? Here is a close up of that early version of the sky, adjusted back to harsh reality, to show what I mean.

Now in the more recent version, where the original colours are painted over, you don’t see any of those murky, completely un-sky like blobs of messed up colour that were supposed to be softer versions of the brighter hues, that didn’t quite work out. It’s much better because my new quinacridone red arrived in the mail. Qunacridone red is a cool, slightly blue red, yet ironically, compared to cadmium red, it blends in a far superior way- in my opinion- with hansa yellow or orange, especially when you add any other translucent pigment to the mix. It also blends well with ultramarine blue to make subtle yet rich purple hues. You can see I have used it to mix a whole range from peach to soft plum, without any sharp transitions.

Unlike the cadmiums, quinacridone red paint has a degree of transparency and luminosity. Aside from the cadmiums, most of the bright pigments, by which I mean any coloured pigment that is not an organic earth tone, have compatible degrees of transparency and luminosity. This means they can be freely mixed and matched without worrying about unplanned shifts from clear tones to chalky murky ones.
Therefore, the main issue to deal with becomes just the fact that some pigments have much more staining power than others, and can too quickly overpower everything they are mixed with. As I mentioned in a post about green, the pigments with the most staining power are the phthalos. They can be controlled by carefully pre mixing them with other pigments that tone them down- either that or just use less powerful pigments if they can do the same job.
Now, aside from the underpainting, the painting of boats, at this post cadmium stage where it’s at now, uses various blends of four main pigments (plus titanium white)- quinacridone red, hansa orange, ultramarine blue– and phthalo green, pre mixed with the other three pigments so I wouldn’t constantly have problems like ending up with bright green when I meant to mix a purplish grey. These days I’m into fluid, transparent paint, so I mix up all the colours I want to use with a lot of liquid acrylic emulsion, in sealable plastic containers for easy access.

I also used an earth tone, yellow ochre, in the trees at left, the interior of the rowboat, and as part of the wash, along with a bit of hansa yellow and hansa orange, for the canoe to make it more of a burnt orange, because otherwise the colour would not have been distinct enough from the rowboat.
Transparent pigments are much better for washes than opaque ones. Yellow ochre, being an earth tone, is very opaque, but I used a lot of acrylic medium. Even with that, it does not create an even wash but tends to create a partly opaque, textured effect, which was good in this case because I was painting a canoe with old, rough paint. Note that this also explains why, if you mix acrylic medium with cadmium paints, they still will not behave like the more translucent pigments.
In the water and sky, I was able to achieve a lot of subtle colour transitions without murkiness. Murkiness to me is an accidental, meaningless shift from luminosity to chalkiness, that dulls down the way colours are perceived, and creates conflicting effects that confuse the eye. Sometimes you might want such a shift from clarity to chalkiness- for example, to show earth emerging from water. Otherwise, I believe it is always best to avoid earth in the sky and water, unless it’s a painting of a dust storm.
I should mention that titanium white is very opaque, but somehow, it is quite luminous at the same time, so it does not dull down translucent colours. When you do want a dull, warm, earthy white, there is unbleached titanium.
Here are some colour mixing tests to show how mixing opaque paint (cadmium red) with a transparent one (hansa yellow) causes murkiness-

The more red part of the range of hues looks okay- if rather garish- but there is an abrupt shift from dull brown to yellow on the right. True, the colours are not blended with a lot of thoroughness, but that is just the point- if the pigments were compatible, they should make a range of interesting effects even or especially where everything is not labouriously blended and flattened. What happened to nice clear yellow orange? If that’s what I was trying to mix, I would be sad about the results.
In contrast, you can see the compatibility of, for example, a mixture of quinacridone red and hansa orange,gradually blended into hansa yellow. Even though this combination does not make pure, screaming bright oranges,they are rich, vibrant and natural.
Note that different monitors may change the way colours are displayed, so if this doesn’t look fabulous on yours, I would still encourage you to try it.

Quinacridone red also has the advantage of mixing beautiful purples, which you cannot do with cadmium red at all (although if you want really bright purples, you need quinacridone magenta and/or quinacridone violet).

But wait- what if you wanted to mix cadmium red with cadmium yellow? They’re both opaque, so they should be more compatible, right? Why certainly, here is what you get:

Note that on the left, you still get a somewhat brownish yellow, but it doesn’t seem to clash, because everything is equally flat and opaque. You would still need to purchase a tube of cadmium orange if you wanted to get a nice clear yellow orange with cadmium yellow. However, it’s apparent that you need cadmium pigments if you want to mix a pure, almost spectral warm red to orange hue.
I’m not sure if this occurs in nature. The closest thing might be orange, the fruit, but is it really quite that orange, or could it be painted just as well with the other pigments? Cadmium hues may still be needed to paint things like pylons, danger signs (in Canada and the United States- I’m told that in Ireland, danger signs are more sensible earthy shades), sports logos, and circus themes such as clowns and artificially coloured orange soda.
Anyway, I started out talking about coffee, so you may wonder, what is my beef about that, anyway?
These days, everyone seems to complain about not having time for anything. I don’t necessarily know that coffee is a primary cause of that, or that many people are as sensitive to it as I have become. I do know that mainstream society seems to be more and more about rushing around like a busy beehive, that coffee, in North America anyway, is a major part of that culture, and that being under the same influence as everyone else doesn’t help to shift gears and do something, like painting, that requires quiet focus and concentration.
Over the last year or so, I started noticing symptoms, including that churning feeling in my stomach, as if I swallowed battery acid, and finding that long periods of concentration did not come naturally anymore- it seems to me now that I should have known that could be caused by sensitivity to coffee. It could be caffeine or it could be other substances in coffee beans, because tea seems to be fine for me.
Now I really do not know whether or not a lot of people are sensitive to coffee and in denial of it. It seems to me that the popularity of dark roast beans could be causing more problems, but that doesn’t mean I would personally switch to light roast and less strong brews. That would be like hearing “gee whiz, why don’t you try switching to tepid dishwater before you give up?”
Anyhow despite the pain and everything, I kept drinking my gut rot strong coffee as I have pretty much every single day of my life for twenty five years. I tried to quit a few times in the past, but those short times don’t add up to much compared to twenty five years, and I obsessed about coffee the whole time while I wasn’t drinking it. Sometimes in recent years I have gotten down to just one cup a day, which seems like nothing compared to I can’t count how many cups a day in college, but that one cup had to be remarkably dense.
Recently something peculiar happened I never would have anticipated, which was that when I drank chai tea with cloves, I didn’t crave coffee anymore, and actually forgot to drink coffee one day. Since then I still keep forgetting.
This is a very good thing, because I find I can focus on painting and become absorbed in it, in a more natural way again. Feeling focused is also directly related to what I wrote about painting as contemplation.
After all, it is not necessary to just keep doing things the same way without questioning them.