Colour mixing

Correct answer: B. In the cyan magenta yellow printing system

Explanation: Primary colours depend on the colour system and medium. In subtractive CMY printing, magenta and yellow inks absorb different parts of white light; together they leave a predominantly red reflection, so red is a mixed result and option B is correct. In the traditional RYB model red is treated as primary, while RGB treats red as a primary light colour. A limited palette alone does not define a formal system.

Correct answer: A. Mix red and blue then add a small amount of yellow

Explanation: The governing concept combines hue formation with saturation control. Red and blue first produce violet. Yellow is approximately complementary to violet in the traditional pigment wheel, so a small amount can neutralise or desaturate it; using only a little avoids turning the mixture muddy. White would lighten rather than darken the colour, and red plus yellow produces orange. Thus option A is correct.

Correct answer: A. Cyan has less red bias

Explanation: The governing concept is pigment colour bias in subtractive mixing. A traditional blue pigment may contain a slight red or violet bias; when mixed with yellow, that unwanted red component can muddy the green. Cyan is closer to a blue-green primary and has less red bias, so cyan plus yellow can reflect a cleaner green. It is not necessarily darker, pre-mixed with white, or always transparent; therefore option A is correct.

Correct answer: B. Slightly dull or brownish

Explanation: The governing concept is pigment bias in subtractive mixing. A blue-biased red contains a small influence of blue; when yellow is added, that unwanted blue influence works against the desired orange and can reduce saturation. The result may therefore look dull, muted or slightly brownish rather than clear and bright. Option B is correct; the mixture does not become completely green or cyan.

Correct answer: B. Blue-biased red and red-biased blue

Explanation: The governing concept is choosing pigments whose colour biases support the target mixture. For violet, a red leaning toward blue and a blue leaning toward red contribute mainly the two needed violet components, so fewer opposing colour influences are introduced. This usually gives a cleaner, more saturated violet. Option B is correct; the other pairs add yellow, green or unwanted black and white effects.

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

Explanation: The governing concept is that a clean secondary colour is produced when both component pigments lean toward that target. Green is formed from blue and yellow, so a green-biased blue combined with a green-biased yellow introduces fewer opposing red or orange influences. Option B is correct. The other pairs contain incompatible hues and would tend to produce a dull or different mixture.

Correct answer: A. Their spectral reflectance and colour bias may differ.

Explanation: The governing concept is pigment selectivity: each pigment absorbs and reflects a particular combination of wavelengths. Two reds may look alike alone but have different spectral behaviour or a different bias toward orange or violet. When mixed, those hidden differences affect the wavelengths removed and the final colour, so option A is correct; the other choices deny pigment chemistry or overstate the brush’s role.

Correct answer: A. They can provide a relatively wide range of clean mixtures.

Explanation: The governing concept is subtractive colour mixing. Cyan, magenta and yellow are useful starting pigments because each mainly removes a different region of reflected light; combining suitable pairs can produce many hues, including green, blue and red-like mixtures. In real paints, impurities may reduce saturation, but the palette still offers broad mixing potential. Thus A is correct, while B, C and D are inaccurate.

Correct answer: A. Mixing it separately with yellow and red pigments and observing the results.

Explanation: The governing concept is colour bias, meaning a pigment’s slight tendency toward a neighbouring hue. Mix the blue separately with a clean yellow and a clean red, keeping quantities and conditions similar. A green-leaning blue generally makes cleaner greens with yellow, while a violet-leaning blue behaves differently in mixtures with red. Thus A is the practical test; the other actions do not reveal hue bias reliably.

Correct answer: A. One adds light while the other absorbs parts of light

Explanation: The governing distinction is between emitted light and reflected light. In additive mixing, such as an RGB screen, coloured light is added; adding channels generally raises brightness and can produce white. In subtractive mixing, inks or pigments remove selected wavelengths by absorption, so layering more colours usually reduces reflected light and may approach a dark result. Therefore the systems behave differently.

Correct answer: A. Light passes through and reflects through the layers sequentially

Explanation: The governing concept is optical mixing, especially in transparent glazing. Light travels through the upper layer, reaches the lower layer or surface, and then returns through the layers; each layer filters particular wavelengths. Physical mixing combines pigment particles throughout one material, whereas glazing keeps them in separate paths. Because filtering occurs sequentially, layer order, transparency, and thickness can change the observed result.

Correct answer: A. A green-like combined effect

Explanation: The governing concept is subtractive colour mixing through transparent layers, often called glazing. Yellow and blue transparent pigments selectively absorb different parts of white light, so the light passing through both layers is commonly perceived as green or greenish. The exact hue depends on pigment quality and transparency. Red, bright white, and black light do not describe the normal combined result.

Correct answer: A. Each medium has different binder and surface behaviour

Explanation: The governing concept is medium-specific paint behaviour. Water can dilute watercolour, but in acrylic, poster colour, oil, or other media, excessive water may disturb the binder, adhesion, drying, surface strength, or permanence. Therefore transparency must be created using the appropriate medium or thinner. Water never automatically turns a colour black, complementary, or secondary.

Correct answer: A. Make a fresh mixture using clean orange-biased red and yellow

Explanation: The governing concept is subtractive pigment mixing and colour bias. An unexpected brown or muddy orange commonly results from blue contamination, dirty tools, or pigments whose biases oppose the desired orange. Starting again with clean tools and a red and yellow that lean toward orange reduces the unwanted third-primary influence. Adding blue, all primaries, black, or grey would make the mixture duller.

Correct answer: A. A warm red helps clean oranges and a cool red helps clean violets

Explanation: The governing concept is a split-primary palette based on pigment bias. A warm, orange-biased red mixes more cleanly with yellow to produce orange, while a cool, violet-biased red mixes more cleanly with blue to produce violet. The two reds do not make pure green, cannot replace blue, and are not restricted to shadows. Their purpose is cleaner, more vivid secondary mixtures.

Correct answer: A. A greenish blue is useful for greens and a reddish blue for violets

Explanation: The governing concept is colour bias in a split-primary mixing system. A greenish or cyan-leaning blue combines with yellow with less red influence, producing a cleaner green. A reddish or violet-leaning blue combines with red with less yellow influence, producing a cleaner violet. The pair does not make yellow, create white by itself, or necessarily have identical temperature.

Correct answer: B. Unwanted blue contamination

Explanation: The governing colour-theory concept is complementary neutralisation. Blue is opposite orange on the traditional colour wheel, so even a small amount of blue contamination can absorb or counter part of the orange mixture and lower its saturation, making it look dull or muddy. Therefore option B is correct. A clean brush prevents contamination, suitable yellow supports the mixture, and white paper generally affects appearance rather than causing muddy pigment.

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

Explanation: The governing concept is pigment bias, or colour temperature within a subtractive mixing system. A red that leans toward orange and a yellow that also leans toward orange contain less unwanted blue influence, so their mixture generally remains brighter and cleaner. Option B is correct. Bluish red, greenish yellow and violet-biased pigments introduce opposing colour tendencies; green and yellow do not directly produce a bright orange mixture.

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

Explanation: The governing concept is the control of unwanted complementary colour in pigment mixtures. Yellow and blue that each lean toward green contain less red influence, so their combination can produce a more saturated, cleaner green. Option B is correct. Reddish or orange-biased yellow and violet-biased blue introduce red, which neutralises green and makes it duller; red and yellow produce an orange family rather than green.

Correct answer: A. Bluish red and reddish blue

Explanation: The governing concept is choosing pigments whose colour biases are close to the desired mixture. Bluish red and reddish blue both lean toward violet, so they introduce less unwanted yellow or green influence and are more likely to produce a clean violet. Option A is correct. Orange-red and greenish blue carry opposing impurities, yellow and red tend toward orange, and yellow with blue tends toward green.

Correct answer: B. Green will lose saturation

Explanation: The governing concept is complementary colour neutralisation. Red and green lie opposite each other on the traditional colour wheel, so adding a small amount of red reduces the purity and saturation of green, usually making it duller or more olive-like. Option B is correct. A complementary addition does not brighten the colour, nor does it transform green directly into pure yellow or blue; a larger amount may push the mixture toward brown or neutral tones.

Correct answer: B. Value and saturation

Explanation: The governing concept is the distinction between value and saturation. Adding white raises the value, making the secondary colour lighter. Adding a complementary colour neutralizes part of the original chromatic strength, thereby lowering saturation and making the mixture duller. Thus B is correct. Hue may shift somewhat in a physical mixture, but size, line, texture, area and proportion are not the two colour properties being tested here.

Correct answer: A. Create several oranges by varying red and yellow proportions

Explanation: The governing concept is controlled colour mixing and variation. Orange is produced from red and yellow, but a real sunset contains changes in hue, value and saturation. Varying the proportion of red and yellow creates warmer, yellower or redder oranges and prevents a flat, repeated appearance. Option A is correct; equal black dulls every mixture, one pure orange lacks variety, and green does not represent the sunset’s dominant colour family.

Correct answer: A. Colour variety and depth will be reduced

Explanation: The governing concept is variation in mixtures, values and saturation. Leaves differ because of light, age, species, surface and distance, so repeating one pure green removes useful visual information. Mixing small amounts of yellow, blue, white, brown or a neutral can create related greens and indicate form and depth. Option A is correct; repetition does not ensure realism, cannot change green into a primary colour, and does not automatically increase complementary contrast.

Correct answer: A. From a reddish yellow or reddish blue

Explanation: The governing concept is pigment bias during subtractive mixing. Green is made by combining yellow and blue, but if either primary carries a reddish bias, that hidden red influence acts like the third primary and partially neutralises the green. Thus option A is correct and can produce a duller mixture. Green-biased pigments are more compatible, while white paper and clean water do not add red pigment to the paint.