Colour mixing

Correct answer: B. A very small amount of green

Explanation: The governing concept is a small complementary correction. Green opposes red on the colour wheel, so adding it in tiny increments can neutralise the unwanted red bias while preserving the mixture’s value more closely than adding white or black. White would lighten it, black would darken it, and more red worsens the error. Because the value is already correct, option B is the controlled choice.

Correct answer: C. Red-violet

Explanation: The governing concept is complementary reduction of saturation. Red-violet lies opposite yellow-green on the colour wheel, so a tiny amount can mute excessive brightness while causing less unintended hue movement than a large correction. Yellow reinforces the existing direction, white increases lightness, and blue shifts the hue. Since the hue is already correct, option C best targets intensity alone.

Correct answer: B. First add a tiny amount of blue, then white as needed

Explanation: The governing concept is changing one colour property at a time. A tiny amount of blue, which is near orange’s complementary direction, reduces its saturation or intensity; white can then raise the value and make it lighter. Adding much black risks making the mixture too dark, while green, red, or all colours together makes the result unpredictable. Therefore option B gives the most controlled sequence.

Correct answer: D. First tool cleanliness, then pigment bias and proportion

Explanation: The governing concept is systematic diagnosis in colour mixing. Dirty tools can introduce an unwanted pigment, pigment bias can shift the mixture away from the expected hue, and an incorrect proportion can prevent the intended secondary colour from appearing. Checking these practical causes in sequence is useful because each can alter the result directly. Paper length, brush price, titles, and palette size do not determine the mixture. Thus option D is correct.

Correct answer: D. Add a tiny amount of complementary colour

Explanation: The governing concept is correcting saturation independently from value. A complementary colour lies opposite the original hue and can reduce its intensity or saturation when added in a very small amount. Care is necessary because too much complement may shift the hue and lower the value. White or black mainly changes lightness, and water changes dilution rather than reliably neutralising a paint colour. Therefore option D is the best controlled method.

Correct answer: A. Colours with the same name can produce different results through different pigments and ratios

Explanation: The governing concept is reproducibility. A colour name describes a general appearance, but paints with the same name may contain different pigments, strengths, or undertones. The final mixture also depends on the quantity or ratio of each component. Without recording measurements, another person—or the same artist later—cannot reliably recreate or compare the result. Therefore option A is correct; the other statements are either false or irrelevant.

Correct answer: B. By changing measured amounts of white or black in the same base brown

Explanation: The governing concept is isolating value from colour temperature. First prepare one consistent brown base, keeping its warm or cool balance unchanged. Then create five samples by adding measured, progressively different amounts of white or black; these adjustments mainly alter lightness and darkness. Changing complements, red, blue, or yellow would also change the hue and temperature. Hence option B provides the most controlled method for a five-value scale.

Correct answer: A. A little red-orange

Explanation: Colour temperature describes whether a colour appears warmer or cooler. Red-orange contributes warm, reddish energy to a brown mixture, so adding it in a small amount can counter excessive blue or green influence. The change should be gradual because a large addition may overpower the mixture. Thus option A is correct. More blue or blue-green would make the brown cooler, while black mainly reduces lightness rather than warming it.

Correct answer: B. The grey already had a blue bias

Explanation: The governing concept is hidden pigment bias in a neutral mixture. If the grey contains a slight blue bias, adding yellow places blue and yellow together, producing a greenish visual tendency. This does not mean that yellow is always green; the result depends on the colours already present. A red bias would tend to counter green, and excess white mainly lightens and weakens the mixture. Therefore, option B is correct.

Correct answer: C. In very small amounts gradually

Explanation: The governing concept is complementary colour mixing: yellow and violet are opposite hues, so they reduce each other’s saturation. Because a complementary addition can change a bright mixture rapidly, yellow should be introduced in tiny amounts, with the result checked after each addition. Option C is correct. Equal or excessive quantities may produce a dull yellow-brown mixture, while black is unnecessary and can make correction harder.

Correct answer: D. Correcting an over-blackened mixture can be wasteful and difficult to control

Explanation: The governing concept is controlled proportion. Black strongly lowers value and can overwhelm the original hue; adding other colours afterward usually requires a large amount of paint and gives an uncertain, muddy result. A fresh mixture allows the base colour and black to be added in measured, small steps. Thus option D is correct. Black cannot simply be removed, water does not restore pigment hue, and white alone cannot guarantee the intended colour.

Correct answer: A. Test each primary colour in small controlled mixtures with the other primaries

Explanation: Pigment bias means that a paint marketed as one hue may lean slightly toward a neighbouring hue. The most useful test is therefore a comparison chart made from small, controlled mixtures of each primary with the others. This reveals the direction and strength of the bias, making option A correct. Reading names gives no mixing evidence, black hides hue relationships, and plain white paper does not test interactions between pigments.

Correct answer: C. Under a coloured light source

Explanation: The governing concept is colour perception under illumination. A coloured light source adds its own hue to the reflected light, so the mixture may appear warmer, cooler, darker, or more saturated than it actually is. Therefore, option C is correct. Neutral daylight or a suitable neutral white light gives a more dependable comparison, and judging a dry sample concerns paint condition rather than the misleading illumination described here.

Correct answer: A. Add a very small amount of its complementary colour

Explanation: The governing concept is controlled neutralisation through complementary mixing. A small amount of the colour opposite it on the colour wheel reduces chromatic intensity because the two colours partially cancel, yet the original hue remains recognisable. Equal black darkens and can muddy the mixture, white changes its value and makes a tint, and water mainly changes fluidity or transparency. Therefore, gradual addition of a little complementary colour is correct.

Correct answer: A. Black is highly potent, so the mixture becomes dark very quickly

Explanation: This is an example of tinting strength in colour mixing. Black is much stronger than white in changing value, so a large addition can make the mixture dark suddenly rather than gradually. Option A is correct. The practical method is to begin with white and add tiny amounts of black while mixing and checking the value. White does not make black transparent, and the other claims are false.

Correct answer: A. Add measured small amounts of one colour to the other while testing samples

Explanation: The governing concept is complementary colour mixing and gradual neutralisation. Complementary colours reduce each other’s chromatic intensity, but the exact neutral result depends on pigment strength and proportion. Adding one colour in small measured amounts, mixing thoroughly, and testing samples gives control and prevents an unwanted colour cast. Therefore option A is correct. Large amounts, black, or white may produce a muddy or merely lighter colour rather than a controlled neutral.

Correct answer: A. Reduce the saturation or value contrast of one colour

Explanation: The governing concept is simultaneous contrast. Strong, highly saturated opposing colours placed edge to edge can make their boundaries seem to vibrate. Reducing the saturation or value contrast of one colour lowers the competing visual energy while preserving colour distinction, so option A is correct. Making both brighter usually intensifies the vibration, mixing them changes them into a neutral mixture, and adding another complement can increase confusion.

Correct answer: B. Blue contaminating the mixture

Explanation: Bright orange is normally produced by mixing red and yellow, so that combination is not the mistake. Blue is opposite orange on the colour wheel; even a small amount can reduce the mixture’s saturation and make it dull, muddy, or brownish. A clean brush and a clean palette prevent unwanted contamination rather than causing it. The most likely error is therefore accidental blue contamination, making option B correct.

Correct answer: B. By mixing the three primaries in controlled unequal proportions

Explanation: The governing concept is neutralisation through colour mixing. When the three primary pigments are combined in carefully controlled proportions, their colour biases partially cancel and the mixture can approach a neutral grey or muted brown. Slightly unequal ratios allow warm or cool neutrals while preserving balance, so option B is correct. Leaving white paper is not mixing, oil does not create neutrality in watercolour, and black alone is not a three-primary mixture.

Correct answer: B. Adding a small amount of a suitable darker analogous or complementary colour

Explanation: The governing concept is controlled colour mixing. To darken a hue while preserving its character, begin with a very small amount of a suitable darker analogous colour; a carefully chosen complementary can also reduce lightness, though too much may neutralise the mixture. Option B is correct. White raises value and makes a tint, varnish changes sheen, and soap is not an appropriate paint additive. Mixing gradually allows accurate adjustment.

Correct answer: A. Plan value and temperature changes separately in stages

Explanation: The governing concept is planned colour mixing in a controlled gradation. Value describes the lightness or darkness, while temperature describes the warm or cool tendency; planning both variables in stages prevents accidental jumps and muddy transitions. A small study can establish the sequence before the final work. Random strokes, only black and white, or untested direct mixing cannot control both changes, so option A is correct.