Colour mixing

The governing concept is value variation within one colour family. A tint is made by lightening a colour, often with white or water depending on the medium, for an illuminated area. A shade or muted darker tone is used for a shadowed area. Therefore option C creates the necessary contrast and depth. Using the same colour everywhere or adding white to both areas cannot describe both light and shadow effectively.

Watercolour normally achieves transparent lightness by allowing the white paper to show through diluted pigment. White paint adds opaque pigment particles, so the mixture may become less transparent even though its value becomes lighter. Therefore option D is correct. Transparency does not always increase, the colour does not disappear, and adding white does not turn a mixed colour into a primary colour.

The governing concept is the drying shift: many paint mixtures appear slightly darker or less bright after water or medium evaporates. Therefore, the artist should prepare the wet mixture a little lighter than the intended final colour and check a small test swatch before applying it widely. Making it darker or adding black would worsen the problem, while avoiding mixing does not correct the value.

The governing concept is pigment strength and incremental mixing. Black usually has a strong visual and tinting effect, so a large addition can reduce the original hue, make the value too dark, and produce a dull result before the artist can correct it. Option D is correct because gradual additions allow control. Black is not a lightener, it does not mix only with white, and it does not generally make a colour transparent.

The governing concept is colour temperature: warm hues such as red and orange push a neutral brown toward a warmer, reddish or golden appearance. A small addition is important because the mixture should be adjusted gradually and not overwhelmed. Option A is therefore correct. Blue would cool the brown, while extra green or violet would not reliably create the requested warm direction and could make the mixture duller.

The governing concept is warm–cool colour temperature. Blue is generally perceived as cool, so adding a small amount shifts a neutral brown toward a cooler, less reddish appearance. Option B is correct, but the quantity must be controlled: too much blue may make the mixture grey, muddy, or excessively dark. Yellow, red, and orange generally push the mixture toward warmer rather than cooler results.

The governing concept is gradual blending in a colour transition. A visible band means the neighbouring colours change too abruptly. An intermediate mixture has a value and hue between the two sides, so applying it across the boundary and blending gently reduces the contrast and creates a smoother gradation. Option C is correct; black would emphasize the edge, leaving it unchanged preserves the band, and paper is not a painting correction.

The governing studio-practice concept is keeping tools and palettes clean to preserve colour consistency. Dried fragments can break loose when a brush or wet paint touches them; they may introduce an unwanted hue, gritty texture, or uneven application into the new mixture. Option D is correct. The particles do not enlarge the palette, renew the brush, or automatically make the colour more transparent, so those alternatives do not address contamination.

The governing concept is that the proportions of component colours control a mixed colour's temperature. Yellow is commonly associated with warmth, while blue tends to make green cooler. Therefore, increasing yellow gradually shifts the green toward a warmer yellow-green; option A is correct. More blue would intensify the cool quality, and violet or black would darken or dull the mixture rather than warm it.

The governing concepts are colour temperature and complementary neutralisation. Blue is a cool colour and lies opposite orange in the traditional colour wheel, so a very small amount can reduce orange's intensity and shift its appearance cooler. Option B is correct. Too much blue may neutralise the orange excessively or make it muddy; yellow and red generally warm it, while white lightens it without specifically cooling or muting it.

The governing concept is contamination during pigment mixing. An unclean brush carries traces of the colour used previously into the new mixture. Repeated dipping therefore adds several uncontrolled pigments, changing the hue, value, and saturation in an unpredictable way. The mixture will not become purer, dry automatically, or turn white. Washing or thoroughly wiping the brush before changing colours keeps the proportions and final result under control.

The governing concept is recording and reproducing a colour formula. If a chart notes proportions, such as two parts yellow to one part blue, the artist can repeat the same relationship instead of relying on memory or guesswork. This improves consistency when preparing a larger quantity or correcting a later section. Recording proportions does not make the paper heavy or thick and does not itself increase brightness, so option C is the only relevant advantage.

The governing concept is controlled adjustment of colour temperature. Warm colours such as red or yellow can shift a neutral grey toward a warmer appearance, but the amount must be very small because grey has low chromatic strength and can change quickly. Blue would generally cool the mixture, black would mainly reduce value, and white would lighten it without reliably adding warmth. Thus option A provides the most precise and limited adjustment.

The governing concept is adjusting colour temperature by changing the dominant component. Green made from yellow and blue appears cooler when the blue influence is too strong. Increasing the yellow proportion shifts the mixture toward yellow-green, which is generally perceived as warmer. Black would mainly darken, white would mainly lighten, and violet would introduce a different hue and may complicate the mixture. Therefore increasing yellow is the most direct and controlled correction, making option B correct.

The governing concept is colour temperature within a hue family. Violet is made from red and blue; increasing the blue component shifts the mixture toward blue-violet, which is generally perceived as cooler. Therefore option C is correct. White mainly makes a tint, extra red makes the violet warmer, and yellow moves the mixture toward a duller neutral or brownish direction rather than reliably cooling it.

The governing concept is the effect of component proportion in a colour mixture. Equal blue and yellow produces a balanced green, but increasing yellow shifts the result toward yellow-green. Thus option D is correct. More blue would make the green bluer, while green plus black creates a darker shade and does not specifically produce yellow-green. The ratio, not merely the names of the colours, determines the direction of the shift.

The governing concept is a tint: a colour mixed with white becomes lighter in value while its basic hue remains recognisable. Therefore option C is correct. Black produces a shade and may reduce brilliance, a complementary colour tends to neutralise or mute the hue, and mixing all three primary colours generally produces a duller neutral mixture rather than a controlled light version of the original colour.

The governing concept is controlled tinting. For a very light pink, white should be used as the light base and red should be added in tiny amounts, allowing the artist to stop at the desired value. Therefore option A is correct. Adding a large amount of white at once is less controllable, black darkens the red, and green tends to neutralise it because it is its complementary colour.

The governing concept is that a mixed colour depends on the proportions and properties of its components, not only on its common name. Different amounts of yellow and blue can produce yellow-green, balanced green, or blue-green, even when each result is called green. Therefore option B is correct. Green is not a primary colour, black is not always present, and paper alone does not explain the systematic hue difference.

The governing concept is controlled colour mixing. Blue and orange are complementary colours, so equal quantities can strongly neutralise each other and create a dull, muddy result. Starting again with small measured amounts on a clean palette gives better control over hue and proportion. Adding every colour, much white, or much black will not restore the original colour and may make the mixture less controllable. Therefore, option A is correct.

The governing concept is temperature-controlled colour mixing. Red-orange is a warm base, and adding only a small amount of blue, which is cooler and complementary to the warm family, reduces its brightness and moves it toward a warm brown. The warm base must remain dominant. Black with blue stays dark and cool, while white with green creates a lighter green; adding blue to violet makes the mixture cooler. Thus, option B is correct.

The governing terminology is tint, shade, and tone. White added to a hue produces a tint, black produces a shade, and grey—or the combined lightening and darkening effect of white and black—creates a less intense tone. Because both white and black are used in small amounts, the colour becomes muted rather than remaining pure. It does not become a new complementary or primary colour. Therefore, option A is correct.

The governing concept is recording and comparing colour mixtures systematically. A useful chart must show the same colours in different measured proportions and label each sample, such as 1:1, 2:1, or 3:1. This makes the effect of increasing one component visible and repeatable, so option C is correct. A list of names identifies colours but shows no ratios; black-and-white samples are too limited, and unlabelled shapes cannot be reliably compared or reproduced.

The governing concept is correcting a tint by restoring the base hue. Too much white dilutes the green and makes the mixture overly pale. Adding the original green gradually increases the proportion of pigment responsible for the hue, strengthening green while retaining a lighter value. Black would darken and dull it, while red or violet would shift the hue away from clean green. Small additions should be mixed and checked after each step. Thus, option A is correct.

The governing concept is complementary colour neutralisation. Red-orange is opposite blue-green on the colour wheel, so a small amount reduces the colour’s chromatic intensity and makes it less brilliant. Option D is correct, but it must be added gradually because too much complementary pigment can produce a dull brown or grey. More blue or green increases saturation, while much white creates a tint rather than a controlled muted colour.