Colour mixing

Correct answer: D. When intensity must be reduced without making the colour much darker

Explanation: The governing concept is the difference between intensity and value. A small amount of a complementary colour reduces chromatic intensity by neutralising the original hue, whereas black mainly lowers value and makes the mixture darker. Therefore D is correct when the colour should look less bright but retain approximately its existing lightness. White is used for lightening, and neither black nor a complementary colour is primarily a transparency control.

Correct answer: A. Keep the wet mixture slightly lighter based on a dry sample

Explanation: The governing concept is accounting for a predictable drying shift. If the medium repeatedly dries darker, the wet mixture should be prepared slightly lighter and judged against a dried test sample. This creates a practical correction rather than relying on the misleading wet appearance. Thus A is correct. Adding black worsens the darkening, stopping tests removes useful evidence, and changing paper alone does not correct a consistent pigment or medium shift.

Correct answer: B. Mostly blue-green with a little red-orange

Explanation: The governing concept is colour temperature in a mixed neutral. Brown can be formed from opposing warm and cool tendencies, but its perceived temperature follows the dominant bias. A mixture led by blue-green with only a little red-orange is therefore more likely to produce a cool brown. Option B is correct; A remains warm because red-orange dominates, yellow with white makes a light tint, and red with yellow tends toward orange rather than brown.

Correct answer: A. Mix each primary colour with the other primaries in small tests

Explanation: Pigment bias means that a paint labelled by one hue often leans slightly toward a neighbouring hue. The governing method is comparative testing: mix each primary with the others in small, labelled samples and observe the direction and cleanliness of the mixtures. Reading names or adding black does not reveal this tendency. A comparison chart makes the bias visible and supports more accurate colour choices, so option A is correct.

Correct answer: D. First make equal black-white greys, then add tiny yellow-orange to one and blue to the other

Explanation: The governing concept is separating colour temperature from value. First prepare two greys with the same black-white ratio, so their lightness is comparable. Then add a very small warm colour, such as yellow-orange, to one and a cool blue to the other. Different amounts of black or white would change value and make the comparison unfair. Since option D controls value before temperature, it is correct.

Correct answer: B. Recreate a given sample by matching its hue, value, saturation and temperature

Explanation: Advanced mixing requires simultaneous control of several properties: hue identifies the colour family, value controls lightness, saturation controls intensity, and temperature describes warm or cool bias. Recreating a sample demands observation, proportion, correction, and repeated comparison across all four properties. The other tasks test naming, drawing, or a single uniform change rather than complex mixing decisions. Therefore option B is the strongest assessment.

Correct answer: A. A red-biased blue and a blue-biased red

Explanation: The governing concept is pigment bias in subtractive colour mixing. A red-biased blue and a blue-biased red contain fewer traces of yellow or green, so they absorb less unwanted light when combined and produce a cleaner, more saturated violet. Option B introduces opposing yellow-green influences, while red-green and blue-orange are complementary pairings that generally neutralise toward brown or grey rather than producing vivid violet.

Correct answer: A. A controlled amount of complementary colour

Explanation: The governing concept is complementary neutralisation. Adding a small, controlled amount of the hue’s complement reduces saturation while retaining some of the original colour character, often creating a more natural muted appearance. A large amount of black mainly lowers value and can make the colour dead; white raises value, and water only dilutes paint without reliably neutralising the hue.

Correct answer: A. A pure warm or cool colour from the same family

Explanation: The governing concept is temperature adjustment within a related hue family. Adding a clean, nearby warm or cool colour shifts the mixture toward warmer or cooler appearance while preserving more chroma than a neutral would. Grey and black reduce saturation, and a complementary colour tends to neutralise the mixture. The amount should remain controlled because excessive addition can change both the intended hue and value.

Correct answer: A. Add a little violet or reddish colour of similar value

Explanation: The governing concepts are colour temperature and value. A very small amount of violet or reddish colour shifts blue toward a warmer appearance, and selecting a pigment with a similar value helps preserve its lightness. Black would lower the value, more blue would normally reinforce coolness, and green would usually move the mixture toward a cooler green-blue direction rather than warming it.

Correct answer: A. Brush and palette cleaning with limited colour selection

Explanation: The governing concept is control of pigment contamination during subtractive mixing. Dirty brushes or a contaminated palette can carry an unintended complementary or third-colour influence into the mixture, causing dull brownness. A limited palette also makes the recipe easier to control. Mixing more colours increases muddiness, black hides rather than solves the cause, and leaving paint uncovered does not clean contamination.

Correct answer: A. A small amount of complementary colour of similar value

Explanation: The governing concept is controlled complementary neutralisation. A small amount of a complementary pigment reduces chroma because the opposing hues absorb one another’s light, while choosing a similar value limits the change in lightness or darkness. Much white raises value, much black lowers value, and water changes transparency or concentration rather than reliably neutralising the colour.

Correct answer: A. A pure colour of the same hue and approximately the same value

Explanation: The governing concept is the separation of hue, value, temperature, and saturation. Saturation means the strength or purity of a colour, so adding a purer pigment of the same hue raises saturation without deliberately changing temperature. Similar value limits a lightness shift. Complementary colour and grey neutralise the mixture, while black lowers value and can also make it duller.

Correct answer: A. The same colour is needed for a large area or repeated work

Explanation: The governing concept is reproducibility in colour mixing. Recording the proportions of pigments or medium creates a repeatable colour recipe, which is especially valuable when a large area must remain even or when the same colour is needed in several sessions. A single small line rarely justifies detailed measurement, while cutting paper and washing a brush are unrelated activities.

Correct answer: A. The light source changes colour perception

Explanation: The governing concept is the effect of illumination on perceived colour, sometimes discussed through metameric appearance. Artificial and natural light have different spectral qualities, so the same pigment can appear warmer, cooler, brighter, or duller under each source. The colour’s value is not automatically changing, and paper size or brush weight cannot explain a lighting-dependent visual shift.

Correct answer: A. Surface texture and absorption change colour appearance

Explanation: The governing concept is substrate interaction in painting. A smooth surface may reflect light more directly, while a rough surface scatters it; an absorbent surface can also remove medium and pigment from the visible layer. These differences alter apparent intensity, texture, and sometimes value. A colour’s name does not change, brush weight is irrelevant, and surfaces do not produce identical results.

Correct answer: A. Add colour in small steps and test a sample at each stage

Explanation: The governing concept is controlled incremental mixing. Adding a small amount at a time makes it possible to observe how each pigment changes value, saturation, and temperature before the mixture moves too far from the target. Testing a sample under the intended conditions also reveals the effect of drying and surrounding context. Large batches are difficult to correct, black can lower value and dull colour unpredictably, and guessing ignores proportion. Therefore, option A gives the most precise control.

Correct answer: B. A very small amount of green

Explanation: The governing concept is the difference between saturation and value. Green is complementary to red, so a very small amount can reduce red’s chromatic intensity and mute its brightness while keeping its value relatively close. The addition must be tiny because excess green will make a dull brown or neutral mixture. A large amount of black lowers value, white raises value and may reduce transparency, and more red increases intensity. Therefore, option B is correct.

Correct answer: D. First make identical greys then add tiny yellow-orange to one and tiny blue to the other

Explanation: The governing concept is that value means lightness or darkness, while temperature describes a warm or cool bias. First mix two greys with the same black-white balance and check that their lightness matches. Then add a very small amount of yellow-orange to one and blue to the other. Option D is correct because it changes temperature while preserving nearly equal value; changing white or black separately would make the values unequal.

Correct answer: A. Add white gradually

Explanation: The governing concept is separating hue from value. Hue identifies the colour family, while value identifies its lightness or darkness. Since the blue-green hue is already correct, gradually adding white raises the value without intentionally introducing a complementary colour. Option A is therefore best. Red-orange could neutralise or shift the hue, black would darken it further, and excessive yellow would change the colour balance.

Correct answer: B. Gradually increase the base red-orange colour

Explanation: The governing concept is chroma or saturation: a mixture looks muted when unwanted neutralising colour has reduced its intensity. Because the value is already correct, the best correction is to add the original red-orange gradually, preferably in small tested amounts. Option B restores the dominant hue and brightness while limiting disruption to value. Black lowers value, blue neutralises further, and much white produces a lighter tint rather than true brightness.

Correct answer: C. Create gradual red tints using measured amounts of white

Explanation: The governing concept is a value scale or tint series. To isolate the effect of white, keep the red pigment constant and add measured, increasing amounts of white to separate samples. Arrange the samples from the original dark red toward the lightest tint and compare their lightness. Option C is correct because only the white proportion changes systematically; complementary mixing or changing every hue would test other properties.

Correct answer: D. A very small amount of orange

Explanation: The governing concept is complementary neutralisation. Blue and orange are complementary tendencies; a very small amount of orange can reduce an excessive blue bias and move the mixture toward neutral grey. It must be added gradually because too much will create an orange or brown bias. Option D is correct. More blue strengthens the error, while black or white mainly changes value rather than reliably removing the blue cast.

Correct answer: A. Surrounding colours alter visual comparison and colour perception

Explanation: The governing concept is colour context, including simultaneous contrast. The eye judges a sample in relation to surrounding colours, so the same paint may seem lighter, darker, warmer, cooler, or more saturated on different grounds. Option A is correct because the perceived appearance changes even when the mixture itself has not chemically changed. The other choices make absolute claims that are not true for all colours or backgrounds.

Correct answer: B. Add a tiny amount of a cool-biased colour of similar value

Explanation: The governing concept is independent control of hue, value, and temperature. Since hue and value are already acceptable, the correction should be a tiny cool-biased addition whose value is similar to the mixture. Option B reduces the warm tendency while causing minimal change in lightness. A large amount of black or white would disturb value, and increasing the warm base would intensify the stated problem.