Last week when I reached for some cadmium orange paint and came up empty I was confused. I'd recently bought two tubes and I don't have any orange paintings, so where did it all go? The answer is qute simple, not that I realized until after looking high and low, through every paint drawer and box, and on every shelf that I might store back up art supplies. I use cadmium orange in underpainting, especially under green grasses like this marsh painting and also to mix darks. I mix it with ultramarine blue and a bit of alazarin to get a deep color that is nearly black, as in the new painting above. Fortunately I happened to be going by the art store the following day and I was able to restock, because one can't get cadmium orange from mixing cadmium red and cadmium yellow.
Some say we are lucky to still have the cadmium pigments to paint with. In the 90's legislation was proposed to ban all the cadmiums due to health and environmental hazards. Amid great outcry from the art community paint for artists' use was excepted from the ban. This article, from the Golden Paints website mentions that even though it is still allowed for art use, it may become increasingly difficult to find as widespread manufacture declines. I sure hope that isn't true.