Secondary colours

Correct answer: A. Yellow influence increases complementary neutralisation

Explanation: The governing concept is complementary neutralisation caused by unwanted pigment bias. Violet is mixed from red and blue, but a yellowish red contains a yellow influence. Yellow lies opposite violet on the colour wheel, so it can reduce violet’s saturation and make the result dull or brownish. Option A is correct. Red is relevant, yellow does not increase saturation here, and blue does not disappear completely.

Correct answer: A. Their colour biases and absorption properties differ

Explanation: The governing concept is pigment bias. Two blue paints may differ in the small amounts of red or green influence they contain and in the wavelengths they absorb. A green-biased blue mixed with yellow usually produces a cleaner, brighter green, while a reddish blue can introduce a complementary red influence and dull the mixture. Therefore option A is correct; the yellow has not randomly changed.

Correct answer: A. It helps create cleaner orange, green, and violet

Explanation: The governing concept is selecting primary pigments by their colour bias. A split-primary palette provides warm and cool versions of each primary, allowing the artist to choose pairs that lean toward the desired secondary colour. Warm red plus warm yellow supports clean orange; green-biased yellow and blue support clean green; suitable red and blue support violet. Option A is correct, while the other choices contradict the purpose of the palette.

Correct answer: A. Warm red and warm yellow

Explanation: The governing concept is choosing primaries whose biases point toward the target secondary colour. Warm red and warm yellow generally lean toward orange, so mixing them introduces less opposing blue influence and preserves higher saturation. Cool red or cool yellow may carry a bluish bias, while blue itself is not the suitable partner for bright orange. Therefore option A is correct and the other pairs are less appropriate.

Correct answer: B. Cool yellow and greenish blue

Explanation: The governing concept is matching pigment bias to the desired secondary colour. A cool yellow commonly leans toward green, and a greenish blue also leans toward green; together they can produce a cleaner, more saturated green. Warm yellow and reddish blue introduce more red influence and may neutralise the mixture. Thus option B is correct. The other pairs either favour orange or contain opposing colour bias.

Correct answer: B. Cool red and reddish blue

Explanation: The governing concept is split-primary colour mixing: pigments with a colour bias toward the target hue produce a cleaner mixture. Cool red, such as a red leaning toward magenta, and reddish blue, leaning toward violet, contain little yellow influence. Mixing option B therefore supports violet, whereas warm yellow or greenish blue introduces yellow or green bias and can make the result dull or muddy.

Correct answer: A. A secondary colour made from red and green light

Explanation: The governing concept is additive RGB colour mixing. In a light-based system, red and green light combine to produce yellow, so yellow is a secondary light colour rather than a primary one. Green and blue combine to produce cyan, while black and white do not create yellow in this model. Thus option A correctly identifies both the mixture and its classification.

Correct answer: A. Because green is primary in the light system

Explanation: Colour categories depend on the medium and its primary set. In the traditional RYB pigment model, green is made by mixing yellow and blue, so it is secondary. In the additive RGB light model, green is itself a primary light colour. Therefore option A explains why green cannot have the same classification in every system; the other statements are factually incorrect.

Correct answer: A. Secondary colours differ in pigment and light systems

Explanation: The governing concept is that colour mixing changes with the medium. In a traditional pigment model, orange, green and violet are commonly treated as secondary colours made by combining primary pigments. In additive light mixing, cyan, magenta and yellow result from combining RGB primaries. Since the primary set differs, option A is the only valid explanation.

Correct answer: A. Contamination by a complementary colour

Explanation: In subtractive pigment mixing, red and yellow should normally produce an orange hue. A small amount of an unintended complementary pigment can absorb additional wavelengths and lower the mixture’s saturation, making the orange appear dull or muddy. Brightness alone does not introduce a neutralising colour, temperature is not the relevant variable here, and paper thickness does not change the pigment mixture itself. Therefore A is correct.

Correct answer: B. Violet becomes neutralised and duller

Explanation: The governing concept is neutralisation through complementary colour mixing. Yellow and violet are complementary, so adding even a small amount of yellow introduces an opposing hue that reduces violet’s chromatic intensity. The mixture therefore becomes less saturated, more neutral, and usually duller, making option B correct. It does not automatically become green, become more saturated, or always increase in value; the exact value depends on the pigments and proportions.

Correct answer: B. Make one colour dominant and use the other two as supporting colours

Explanation: Harmony in a colour scheme depends on unity, proportion, and a clear visual hierarchy rather than mechanical equality. Making one secondary colour dominant and using orange, green, or violet in smaller supporting roles gives the eye a stable focus while preserving variety. Therefore option B is most effective. Equal areas can create competition, excessive black can dull the palette, and covering each colour with its complement may produce harsh contrast instead of harmony.

Correct answer: B. Bright orange on a dark blue background

Explanation: A warning sign needs strong visibility, so both hue contrast and value contrast are important. Bright orange is strongly separated from dark blue because they are near complementary colours on the colour wheel, and their lightness difference makes the sign easier to notice and read. Option B therefore gives the most effective combination. Yellow, brown, and white backgrounds in the other choices either reduce hue contrast, reduce value contrast, or make the orange appear weak and less urgent.

Correct answer: A. Against green of similar value and hue

Explanation: Figure-ground clarity depends heavily on the contrast between an object and its background. If the green shape and the surrounding green have similar hue and similar value, their edges and tonal differences become weak, so the shape is likely to blend into the background. Option A is therefore correct. Dark red, bright violet, and white usually create stronger hue or value differences, making the green shape easier to separate visually.

Correct answer: B. Shift it toward red and increase saturation

Explanation: Perceived depth in painting is influenced by colour temperature, saturation, and contrast. A violet shifted toward red becomes warmer, and increased saturation generally makes it more visually advancing than a cool, dull blue-violet. Thus option B is the best modification for making the object appear closer. Adding grey or making it bluer usually pushes it back, while matching its value to the background reduces separation rather than creating a convincing foreground effect.

Correct answer: A. The mixture contained components of all primary colours

Explanation: The governing idea is pigment composition and neutralisation. Orange contains red and yellow, green contains yellow and blue, and violet contains blue and red. Mixing all three therefore brings all three primary components into the same mixture; their overlapping absorption reduces chromatic intensity and produces a neutral brown or grey. Option A gives the correct analysis. Secondary colours do not lose a theory, paper whiteness is not the sole cause, and violet does not turn mixtures white.

Correct answer: A. It is formed by mixing two primary pigments

Explanation: In the traditional subtractive pigment system, a secondary colour is defined by its origin: it results from mixing two primary pigments, such as red and yellow producing orange. Therefore option A is correct. Option B describes light emission rather than pigment mixing, while black and white do not define a secondary hue. Option D is the opposite of the governing concept.

Correct answer: A. Pigments differ in colour bias, transparency and absorption

Explanation: An ideal colour wheel represents simplified, clean relationships, whereas real pigments have different colour biases, transparency, particle behaviour and absorption spectra. These properties affect the mixture and can shift its hue or reduce its saturation. Thus option A is correct. Orange is present on a normal colour wheel, red and yellow can produce it, and paper does not change its colour category into a primary colour.

Correct answer: B. Orange-biased red and orange-biased yellow

Explanation: For a vivid orange in pigment mixing, choose a red and a yellow that both lean toward orange. Their colour biases contain less unwanted blue or violet influence, so the mixture remains cleaner and more saturated. Option B is correct. Bluish or violet-biased red introduces a complementary influence that dulls orange, while reddish blue is not the appropriate red primary for this mixture.

Correct answer: B. Orange loses saturation

Explanation: In pigment theory, blue is complementary to orange. Even a small amount of blue introduces an opposing colour influence, so the orange becomes less saturated, duller or slightly neutralised. Option B is correct. It does not become purer, white or a primary colour. The exact visual result depends on pigment strength, but the governing effect is reduced chromatic intensity.

Correct answer: B. Their colour biases differ

Explanation: Real pigment colours are not perfectly pure; each has a colour bias. A greenish blue contains less unwanted red influence and usually mixes with yellow to make a cleaner green. A reddish blue carries more red, which can partially neutralise the mixture and make it duller or shift its hue. Therefore option B explains the difference; the yellow is not changing randomly.

Correct answer: A. Green-biased yellow and green-biased blue

Explanation: Green is produced by mixing yellow and blue pigments. To obtain maximum saturation, both pigments should lean toward green, because this minimises unwanted red or orange influences that would neutralise the mixture. Option A is therefore correct. Option B contains opposing biases, while red and blue do not provide the clean yellow-blue combination required for vivid green; red and yellow produce orange instead.

Correct answer: B. Violet-biased red

Explanation: Yellowish green contains both green and a noticeable yellow tendency. A violet-biased red is useful in a very small amount because red opposes green, while the violet component also opposes yellow. This combined complementary influence reduces chroma and neutralises the mixture. Option B is best. Blue alone can shift the colour but does not balance both unwanted components as effectively, and yellow would intensify the bias.

Correct answer: B. Bluish red and reddish blue

Explanation: Violet is made by combining red and blue pigments. For a vivid result, the red should lean toward blue or violet and the blue should lean toward red or violet, so unwanted yellow or green influence is minimised. Option B is correct. Orange- or yellow-biased pigments introduce yellow, which is complementary to violet and can lower saturation; the other pairs do not provide the appropriate combination.

Correct answer: B. The influence of the third primary yellow enters the mixture

Explanation: A yellowish red and a greenish blue each carry unwanted yellow influence. When they are mixed to make violet, that extra yellow acts against violet, reducing saturation and producing a dull or muddy appearance. Thus option B is correct. Violet is not naturally always muddy, and blue does not turn red white. Choosing red and blue pigments with violet-compatible biases gives a cleaner result.