To create clear purples, keep away from the combination of a warm red (e.g. A touch of red will neutralise greens, making them more olive. A cool yellow and cool blue will make bright greens that you may not see so much in the real world. Ultramarine) and a warm yellow (leaning towards orange e.g.Cadmium Yellow Deep or New Gamboge) will make a great range of useful greens. This is especially useful when mixing greens - a warm blue (leaning towards purple e.g. Alternatively a cool yellow (a yellow leaning towards green) and a cool red (a red leaning towards purple) will create a dull, or neutralised orange - which can be more useful if painting from life. This means that a warm yellow (which means a yellow leaning towards orange: an orange-yellow) mixed with a warm red (a red leaning towards orange: an orange red) will create a pure bright orange.
Mixing each pair will create a range of secondaries that will vary according to whether the colours are bright, warm, cool or neutralised.
Mixing all three together will create a grey. These are based on a primary palette of red, yellow and blue. It will of course limit the hues that can be mixed, but will create wonderful unity in the painting. Here are some to try. If a colour needs more blue, there is only one blue you can add. Working with a limited palette of just one red, yellow and blue can be very freeing as there are less choices to make. It can add up to a lot of tubes of colour. Added to this, the same hue can be useful in a granulating and a non-granulating pigment formula, or an opaque and a transparent paint. Watercolour comes in smaller tubes, is more economical to use and lasts for so long that water-colourists tend to build up more colours. They may also add some favourite special colours such as a bright orange, purple, green or turquoise. This may include one or two reds, one or two yellows, probably two blues, an earth colour or two such as Burnt Sienna and yellow ochre, which along with black and white will create all the artist needs. In Oils and Acrylics it is common for artists to have a fairly limited palette.
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