Colour mixing

The governing practical principle is tool cleanliness in colour mixing. A brush carrying leftover paint can introduce an unwanted colour into the next mixture, changing its hue and making the result muddy or inaccurate. Therefore, option A is correct: a clean brush helps keep colours pure and clear. Cleaning a brush does not thicken paper, enlarge a drawing, or require the brush to remain permanently colourless; it simply prevents contamination between mixtures.

The governing concept is controlled colour mixing. Beginning with small amounts allows the artist to observe the result after each addition and gradually approach the desired hue, value, or intensity. If too much paint is added at once, correcting the mixture becomes difficult and may waste material. Therefore, option B is correct; the other choices do not explain the purpose of using small quantities.

The governing concept is variation through colour mixing. When primary colours are combined in different proportions, the mixture changes in hue and intensity; for example, more yellow or more blue changes the character of a green mixture. This creates a wider range of colours for the painting. Using one colour or removing colours reduces variety, while only adding black mainly changes darkness. Therefore, option C is correct.

The governing concept is a tint, which is made by adding white to a colour. White increases the lightness or value of the primary colour, producing a lighter version while retaining its basic colour identity. It does not create a secondary colour, remove all colour, or make the colour darker. Thus, option D is correct. In contrast, adding black generally produces a shade, or darker version.

The governing concept is a shade, produced when black is added to a colour. Mixing black with a primary colour lowers its lightness and creates a darker version while generally retaining the colour family. White would produce a lighter tint, not a shade. The mixture does not automatically become neutral grey or transparent. Therefore, option A is correct, although the exact appearance can depend on the amount and type of paint used.

The governing concept is the creation of a tint by adding white. When white is mixed with blue, the lightness or value of blue increases, producing a lighter blue. This does not combine blue with another hue to form green or violet, and it does not make the colour darker. Therefore, option B is correct. The exact lightness depends on how much white is added, but the general effect remains a lighter version of blue.

The governing concept is a tint: adding white makes a colour lighter without changing its basic hue. When white is mixed with red, the result is generally pink, a lighter tint of red. Orange requires red and yellow, violet requires red and blue, and brown is produced through different combinations or darkening mixtures. Therefore, option C is correct. The precise pink depends on the proportion of white added.

The governing concept is the function of art tools. A palette offers a clean, usually flat working surface where measured amounts of paint can be placed, blended, and adjusted without applying the mixture directly to the artwork. Therefore, option C is correct. Paper cutting requires a separate tool, brushes are normally cleaned or dried with suitable materials, and a palette does not cover the drawing. Its main purpose is controlled colour preparation.

The governing concept is practical colour testing: a colour may look different while wet, in a large amount, or on a palette than it does when applied to the final surface. Applying a small sample to paper lets the artist observe its true hue, brightness, coverage, and drying effect before using it. Therefore, option B is correct. Throwing it away wastes material, while an unwashed brush or adding every colour increases contamination and muddiness.

The governing concept is subtractive mixing of physical pigments. Each pigment absorbs some wavelengths of light; when several pigments are combined repeatedly, the mixture absorbs a wider range of light and reflects less clean colour. Its saturation and brightness therefore decrease, making it appear dull or muddy. Option C correctly describes this effect. Paper colour, brush size, and drying time do not explain why excessive pigment mixing reduces colour clarity.

The governing concept is preventing cross-contamination during colour mixing and sampling. A brush that still carries red pigment can unintentionally contaminate yellow or blue, changing their hue and reducing purity. Using a separate clean brush for each primary colour keeps samples reliable and makes comparisons easier. Thus option C is correct. Separate brushes do not make paint dry faster, increase paper shine, or change the physical size of the painting.

According to traditional subtractive colour theory for paints, red and yellow are two primary colours. When they are mixed, they produce orange, which is a secondary colour; therefore, option C is correct. Green is formed from yellow and blue, while violet is formed from red and blue. Grey is not the standard result of mixing this primary-colour pair.

In traditional paint or pigment mixing, yellow and blue combine to produce green. Green is a secondary colour because it is made by mixing two primary colours, so option D is correct. Orange comes from red and yellow, and violet comes from red and blue. The exact shade may vary with the pigments and their proportions, but the standard school answer remains green.

With a traditional paint set of red, yellow and blue, the painter can directly create orange by mixing red and yellow. Orange is a secondary colour produced from two primary pigments, so option D is correct. White is generally not obtained by pigment mixing, gold requires a special pigment or effect, and black is not the standard school result intended by this particular pair of primary colours.

Orange is the secondary colour formed when the primary colours red and yellow are mixed in the traditional paint colour system. Therefore, the missing primary colour is yellow, making option A correct. Mixing red with blue produces violet, while green and violet are already mixed colours rather than primary colours in this model. The result may be lighter or darker depending on the proportions used.

In the traditional paint colour wheel, red and blue are the two primary colours that combine to produce violet, a secondary colour. Thus, blue is needed with red and option C is correct. Yellow mixed with red produces orange, not violet. Green and orange are secondary colours in this model, so they are not the appropriate primary-colour partner requested by the question.

The governing concept is colour mixing by proportion. Green is produced from yellow and blue; when yellow is used in a greater amount, its visual influence becomes stronger, so the mixture shifts toward a yellowish, usually lighter-looking green. Option A is therefore correct. Option B would describe a mixture containing more blue, while red and grey are not the controlling components in this mixture.

The governing concept is dominance in a colour mixture. Violet is made by combining red and blue. If the mixture contains more blue than red, the blue component has greater visual influence, so the violet shifts toward blue. Option B is correct. Yellow would move the mixture away from violet, green comes from blue plus yellow, and orange comes from red plus yellow, so the other options do not fit.

The governing concept is colour cleanliness during mixing. A dirty brush carries leftover pigment from an earlier colour into the new mixture. That unintended pigment changes the hue and may make the result dull, muddy, or impure, so option D is correct. A clean brush supports clearer mixtures; it does not make paper shine or automatically lighten colours. Washing the brush between mixtures is therefore an important studio precaution.

The governing concept is subtractive paint mixing and colour proportion. Yellow mixed with blue moves toward green; because only a small amount of blue is added, yellow remains dominant, so the result is yellowish green and option B is correct. Reddish orange requires red with yellow, while bluish violet requires red with blue. Brown would generally require a more complex mixture or stronger neutralising components, not this simple combination.

The governing concept is colour mixing with one dominant component. Blue combined with red moves toward violet or purple. Since the quantity of red is small, blue remains dominant, producing bluish violet; therefore option C is correct. Yellowish green comes from yellow and blue, reddish orange comes from red and yellow, and bright yellow does not result from adding red to blue. The proportion explains the word “bluish.”

The governing concept is hue bias caused by unequal proportions. Red and yellow combine in the orange range; because only a little yellow is added, red remains the dominant visual influence. The mixture therefore has a reddish-orange tendency, so option D is correct. Bluish violet requires blue and red, yellowish green requires yellow and blue, and grey blue is not the expected result of this two-colour warm mixture.

In painting, adding white increases the lightness or value of a colour and produces a tint. For example, white mixed with blue gives a lighter blue, not a new secondary colour. Therefore option C is correct. Darker colours are made by reducing value, commonly with black or a darker colour; secondary colours result from mixing different primary colours with one another.

Black lowers the value and usually reduces the apparent brightness of a colour. Adding a small amount to red, yellow or blue therefore creates a darker shade rather than changing the colour into a secondary colour. Option D is correct. White would create a lighter tint, while secondary colours are formed by combining two different primary colours, not by adding black.

In the traditional subtractive art colour model, yellow mixed with blue produces green, so option C is correct. Yellow mixed with red produces orange, which is the mixture mentioned for comparison. Violet is produced by combining red and blue, and adding blue to yellow does not create pure red. The exact hue can vary with pigment, but green is the expected school-level answer.