The phrase "as primary Colours" is correct and usable in written English.
It can be used when discussing color theory, design, or art, specifically referring to the fundamental colors that can be combined to create a broad spectrum of other colors.
Example: "In this painting, the artist has chosen to use red, blue, and yellow as primary Colours to create a vibrant and dynamic composition."
Alternatives: "as fundamental colors" or "as basic colors".
It used a colour screen (a glass plate covered with grains of starch dyed to act as primary-colour filters and black dust that blocked all unfiltered light) coated with a thin film of panchromatic (i.e., sensitive to all colours) emulsion, and it resulted in a positive colour transparency.
We selected yellow and grey as our primary colours for a few reasons.
Outlines are drawn in bold manner, making objects stand out from the background an effect particularly aided by the rich use of brown, green, and yellow as the primary colours.
In person though, this confidence is superficial both in its physical manifestation, as the bright, primary colours of Jackson's recent outfit at the Mercury Prize awards and tonight's monochrome ensemble, as well as conceptually, with an emotional fragility underlying the bulk of their material.
Indeed, his primary colours are as important a feature of his colour film-making henceforth as his stars or his script (which was a back-of-a-napkin narrative shred, as usual).
The revamped Broadcasting House may be notoriously late and over-budget, but some of the sections which have reopened are almost as poky as before, and decorated in basic primary colours.
But it's also because there is something infantalising about wearing engulfing primary colours as outerwear.
The group referred to this approach as working within the "primary colours" of rock music guitar, bass, and drums.
Eddy Current Suppression Ring's lead singer, Brendan Suppression (real name Brendan Huntley), explained the choice of Primary Colours as its title, saying that the band chose it because they "believe...that something beautiful can be made through simple colours or notes or lyrics".
In 2008 09 and 2009 10, Thistle became the first football club in Scotland to use pink as the primary colour in their away kit.
