Colour mixing

The governing concept is subtractive colour mixing and colour purity. In ordinary paint, yellow mixed with blue produces green, while clean, strong pigments and a clean palette prevent unwanted contamination. Therefore option C gives the clearest, brighter green. A dirty brush may introduce red or blue residue, black lowers value, and mixing many colours usually produces a dull, muddy result.

A tint is made by mixing a hue with white, which raises its lightness while retaining its basic colour identity. To create a systematic scale, prepare equal portions of the same hue and add progressively larger, measured amounts of white. Thus option A is correct. Adding black creates shades, complementary colours change or neutralise the hue, and identical samples cannot show a progression.

The governing concept is the difference between tints and shades. A shade is produced by adding black to a hue, thereby lowering its lightness or value. As the scale moves toward the darkest sample, the measured amount of black increases gradually. Therefore option B is correct. White would create lighter tints, water mainly changes transparency in watercolour, and yellow changes hue rather than systematically darkening it.

The governing concept is tinting a prepared colour. A warm brown already contains a warm, earthy hue; adding white increases its lightness and produces a lighter warm-brown tint. Therefore option A is the best answer. Blue with black becomes a dark blue shade, blue-green remains in the cool family, and yellow added to violet tends to neutralise or shift it rather than reliably create a light warm brown.

The governing concept is prevention of unwanted pigment contamination. Residual paint on a brush or palette can enter the next mixture, adding an unintended hue and lowering its clarity. Therefore option D should be corrected first: clean or rinse the brush and remove contaminated paint before beginning each new mixture. Labelling samples, changing palette size, or rotating the paper does not remove stray pigment and cannot directly prevent muddiness.

The governing concept is reproducibility through controlled proportions. If an artist records or measures, for example, two parts yellow and one part blue, the same ratio can be recreated with a larger or smaller batch. Measurement does not make paint dry faster, clean a brush, or guarantee brightness; the final appearance also depends on pigments and medium. Therefore option A describes the direct benefit.

Black and white are achromatic colours, meaning they do not contribute a distinct hue. Mixing them in equal amounts produces a middle-value neutral grey because neither colour family dominates. Red with white produces pink, blue with green produces a coloured mixture, and black with yellow is not a reliable neutral-grey combination. Therefore, option C is correct.

The governing concept is selecting a suitable tool for the consistency of the medium. A palette knife spreads and folds thick paint across the palette, producing an even mixture while keeping the brush from absorbing unwanted pigment. Thus option A is correct. Drawing lines, drying water, and cutting paper are not the intended functions of this painting tool and do not explain its mixing advantage.

The governing concept is preventing pigment contamination during colour preparation. White reveals traces of other colours very easily, so a separate clean brush or mixing tool preserves its purity and allows reliable tints to be made. Option B is correct. Adding every colour or black deliberately contaminates the white, and neglecting palette cleaning leaves residue that can transfer into the paint. Clean tools and a clean mixing area are the practical correction.

The governing concept is subtractive colour mixing used with paints. Red and yellow are primary paint colours, and combining them produces the secondary colour orange; therefore option A is correct. Green requires yellow and blue, while violet requires red and blue. Blue is not produced by this pair. The exact shade can vary with pigment proportions, but the expected school-level result is orange.

The governing concept is secondary-colour formation in paint. Blue and yellow are combined to produce green, so option B is correct. Orange comes from red and yellow, and violet or purple comes from red and blue. Brown may result from several mixtures containing multiple pigments, but it is not the standard result of this two-colour combination. The precise green may be warmer or cooler depending on the pigments used.

The governing concept is secondary-colour formation with paint pigments. Mixing red and blue produces violet, so option C is correct. Green is produced by blue and yellow, orange by red and yellow, and yellow is not created by combining red and blue. Depending on the proportions and pigment strength, the mixture may appear more reddish or bluish, but its expected colour family is violet.

The governing concept is tinting: adding white to a colour makes a lighter version of that colour. Therefore, red mixed with white produces pink, making option D correct. Orange requires red and yellow, violet requires red and blue, and brown usually requires a different combination of pigments. The amount of white controls the lightness, so more white creates a paler pink tint.

The governing concept is neutral-value mixing. Black and white are not chromatic hues; combining them produces grey, so option A is correct. The proportion determines the value: more white creates a light grey, while more black creates a dark grey. Green, orange, and violet require chromatic pigments such as blue, yellow, or red, so none of those options fits this mixture.

The governing concept is controlled colour mixing. Dark pigments usually have a stronger visual effect than light pigments, so adding a large quantity at once can make the mixture too dark and difficult to correct. Add the dark colour in small amounts, mix thoroughly after each addition, and observe the result before adding more. This gives better control of the final shade; the other methods do not produce a reliable mixture.

The governing concept is subtractive mixing of basic painting colours. Yellow mixed with blue generally produces green in school-level poster-colour practice, so option B is correct. Yellow with red produces orange, and blue with red produces violet; these correspond to the other common colour pairs. The exact shade can vary with pigment proportions, but the expected named result remains green.

The governing colour-mixing idea is that adding black lowers the lightness of an existing colour and produces a darker shade. Therefore option B is correct. Only a very small amount should be added because black is visually strong and can quickly overpower the original hue. White would make a tint, whereas black does not make the colour transparent or cause it to disappear.

The governing colour-mixing principle is that black and white produce neutral grey. The proportions change its value: more white gives a lighter grey, while more black gives a darker grey. Therefore option A is correct. Green generally requires blue and yellow, orange requires red and yellow, and violet requires red and blue; none of those hues can be obtained using only black and white poster colours.

The governing concept is colour purity during mixing. If dried or leftover paint remains on the palette, it can contaminate the fresh colour and change its hue or value. Unwanted mixtures often reduce brightness and make the result look dull or muddy, so option A is correct. A dirty palette cannot make colours glow, renew a brush, or alter the thickness of the paper; those distractors are unrelated to mixing.

The governing concept is maintaining colour purity. Rinse the brush between colours and replace dirty water so unwanted pigment does not enter a fresh mixture. Use a clean palette and mix only the colours needed; excessive or accidental mixing often produces a dull, muddy result. Option A is correct. Adding many colours, excessive black, or using a dirty cloth introduces contamination and cannot preserve brightness.

In colour theory, a tint is a lighter version of a hue made by adding white. Thus, mixing the original poster colour with white creates a light tint, making option A correct. The amount of white controls the lightness: more white generally produces a paler result. Black lowers the value and creates a shade, while sand and oil are not the standard materials for making a poster-colour tint and can spoil the paint’s consistency.

A shade is a darker version of a colour, and it is made by adding black to the original hue. Therefore, option B is correct. Black should be added in very small amounts because it can reduce the colour’s lightness quickly. White produces a tint, water mainly dilutes the paint and may change its flow, and glue is not the normal ingredient for creating a darker shade in poster colour.

The governing concept is reproducible colour mixing. If a mixture uses, for example, two parts yellow and one part blue, recording that ratio helps the artist prepare the same hue again when more paint is needed. Thus option A is correct. The ratio has no role in measuring brush length, changing paper size, or directly speeding drying; those distractors concern unrelated materials or processes.

In basic subtractive colour mixing, red and yellow combine to produce orange, a secondary colour. The exact shade can vary with pigment characteristics and proportions, but orange is the expected result in school-level watercolour theory. Green comes from yellow and blue, violet from red and blue, and blue is not formed by mixing these two. Therefore, option C is correct.

Blue and yellow watercolour pigments are taught as a primary-colour pair that produces green, a secondary colour. The resulting green may be warmer or cooler depending on the particular pigments and their proportions, but green is the standard answer. Red with blue produces violet, red with yellow produces orange, and brown is not the intended basic result. Hence, option D is correct.