Tertiary colours

The governing concept is colour temperature: yellow is generally perceived as warmer, while blue and green usually make a mixture cooler. Yellow-green already contains both hues, so increasing the yellow proportion shifts its visual bias toward the warm side. Increasing blue or green would cool or neutralise it, and violet is not the direct warm adjustment. Therefore, option B is correct.

On a conventional twelve-part colour wheel, a standard tertiary colour is made by mixing a primary colour with the neighbouring secondary colour, such as yellow-green, blue-violet, or red-orange. Red and green are not adjacent; they are complementary opposites. Their mixture tends toward a dull or neutralised colour rather than a named standard tertiary hue. Therefore, option D is correct.

The governing concept is emotional colour association in visual communication. Red-orange lies on the warm side of the colour wheel and combines the excitement of red with the brightness and warmth of orange. This makes it a strong choice for suggesting energy, action, and heat in a poster. Blue-green and blue-violet feel cooler, while yellow-green is less directly associated with heat. Hence, option A is correct.

The governing concept is colour scheme classification by hue. A monochromatic scheme keeps one hue constant and changes its value or intensity, for example by using lighter tints and darker shades of blue-green. Complementary, triadic, and split-complementary schemes require two or more distinct hue positions on the colour wheel. Since only blue-green is used here, option A is correct.

The governing concept is the functional role of tertiary colours in visual design. Because they lie between primary and secondary hues, they create intermediate steps, smoother transitions, richer palettes, and more nuanced colour harmonies. They do not remove primary colours or automatically turn every colour grey. Memorising names is useful for study but is not their practical artistic purpose. Therefore, option D is correct.

The governing concept is the position of a colour on the traditional colour wheel and the balance of warm and cool influences. Red-violet contains red, but its violet component shifts it toward the cool side. Red-orange and yellow-orange are warmer because they contain orange, while yellow-green has no red component. Therefore, red-violet is the best answer.

The governing concept is proportional colour mixing. Yellow-orange is made from yellow and orange; if yellow is reduced while the orange component remains, orange has greater relative influence. The mixture therefore shifts toward orange. It does not move toward green, blue, or violet, because none of those colours becomes more prominent through this adjustment.

The governing concept is the distinction between hue and value. Hue names or identifies the colour family, such as red, blue, or green. Value describes how light or dark that colour appears, regardless of whether it is primary, secondary, or tertiary. Thus option C is correct; the other statements incorrectly make value identical to colour or restrict it to tertiary colours.

The governing concept is the effect of component proportions in a mixed or intermediate colour. Blue-green contains both blue and green. Increasing the green component makes green visually dominant, so the mixture appears greener. Increasing blue would push it toward blue, while red or violet would alter the colour in another direction rather than strengthen its green identity. Therefore D is correct.

The governing concept is the ordered progression of neighbouring hues on a colour wheel. Moving from violet toward blue passes through blue-violet, a tertiary colour formed from the adjacent colours blue and violet. Red-violet moves toward red, while blue-green and yellow-green lie on other parts of the wheel. Hence the sequence in option A shows the correct transition.

The governing concept is the organisation of hues around the colour wheel. Tertiary colours are produced by mixing a primary colour with a neighbouring secondary colour, so they occupy intermediate positions. These transitions make relationships between hues smoother and the wheel more complete. They do not replace primary colours, produce only black and white, or reduce the wheel to six sections. Therefore B is correct.

Blue and green are adjacent on the traditional colour wheel. Mixing blue with a smaller amount of green shifts the result toward green while retaining blue as the dominant hue, producing blue-green; therefore option D is correct. Yellow-green is also a tertiary colour, but it requires yellow and green. Red-violet and red-orange involve red, which is absent here.

The governing concept is colour classification by neighbouring positions on the colour wheel. Yellow is a primary colour and green is a secondary colour; combining these adjacent colours produces yellow-green, which is classified as a tertiary colour. Thus option B is correct. It is not a primary colour, because it is made from other colours, and it is not a neutral colour or merely a shade produced only by changing lightness.

The governing concept is the formation of tertiary hues from adjacent colours. Red-orange lies between red and orange on the colour wheel, so it is made by mixing red, a primary colour, with orange, a neighbouring secondary colour. Therefore option C is correct. Red and blue produce violet, yellow and green produce yellow-green, and blue and green produce blue-green, so the other pairs name different results.

The governing concept is tertiary-colour formation through mixing neighbouring hues. Red-violet lies between red and violet on the colour wheel, so combining red, a primary colour, with violet, an adjacent secondary colour, gives red-violet. Option A is therefore correct. Yellow-orange, blue-green, and yellow-green are also tertiary hues, but they arise from the different pairs shown in the other options.

The governing concept is tertiary colour formation. Yellow-orange is made by mixing the adjacent colours yellow and orange on the colour wheel, generally using one colour in a larger amount and the other as an adjusting amount. Therefore, option C is correct. Blue and violet, red and violet, and green and blue produce cool or different colour relationships, not yellow-orange.

The governing concept is the simultaneous contrast of complementary colours. When opposites on the colour wheel, such as blue and orange, are placed side by side, each colour appears more vivid because the neighbouring hue emphasizes its difference. Option D is correct. This is different from mixing complements, which usually reduces saturation and can produce a duller neutral colour; the choices about invisibility, matte finish, or identical appearance are false.