Colour mixing

Correct answer: A. Yellow and Green

Explanation: Colour mixing explains the relationship in this question. Yellow is a primary pigment, while green is a secondary colour produced by mixing yellow with blue. Thus option A gives one primary colour and a secondary colour made with it. Green, orange and violet are secondary colours, so the other pairs do not satisfy the required order and relationship.

Correct answer: D. A deeper reddish orange

Explanation: Colour mixing depends not only on which pigments are combined but also on their relative proportions. When red is used in a greater amount than yellow, the resulting orange shifts toward red and may look deeper or more reddish. Therefore, option D is correct. More blue or green would require different pigments, while grey is not the expected result of changing the red-yellow ratio.

Correct answer: C. Many secondary and mixed colours can be created

Explanation: The governing concept is that primary colours serve as the basic palette for creating other hues. By mixing them in balanced or varied proportions, a painter can produce secondary colours such as orange, green, and violet, along with many intermediate shades. Therefore, option C is correct. Mixing does not create only one colour, turn every colour white, or alter the paper itself; it changes the applied paint mixture.

Correct answer: A. Balanced orange

Explanation: The governing concept is equal-proportion mixing of two primary colours. Red and yellow combine to make orange; when both are present in equal amounts, neither component dominates, so the result is generally a balanced orange. Option A is correct. More blue would be needed for green, red and blue would produce violet, and grey is not the expected result of this clean two-colour mixture.

Correct answer: B. Balanced green

Explanation: The governing concept is the formation of a secondary colour through equal mixing. Blue and yellow are primary colours, and their combination produces green. Equal quantities mean that neither component dominates, so the expected result is a balanced green; option B is correct. Orange requires red and yellow, violet requires red and blue, and brown is not the standard clean result of this two-colour combination.

Correct answer: C. Balanced violet

Explanation: The governing concept is secondary-colour formation through equal mixing. Red and blue are primary colours, and their mixture produces violet. Because the two colours are used in equal amounts, neither dominates, so the result is generally a balanced violet; option C is correct. Green comes from blue and yellow, orange from red and yellow, and yellow alone is a primary colour rather than the product of this pair.

Correct answer: A. Yellow may lose brightness and become dark and muddy

Explanation: Adding black lowers the value of yellow, so its lightness and brightness decrease. When too much black is added, the mixture can look dark, dull or muddy, making the original yellow less clear. Option A is correct. Orange requires red mixed with yellow, while a pale tint requires white; neither result is caused by adding black.

Correct answer: D. A dark muddy or brownish colour

Explanation: Pigment mixing is subtractive: each pigment absorbs some wavelengths of light, and combining all three traditional primaries absorbs much of the visible spectrum. The result is usually a dark, dull, muddy brown or near-black colour, not bright white. Therefore option D is correct. Bright white is associated with reflected or combined light, while yellow and green result from particular two-colour mixtures.

Correct answer: A. A more yellowish orange

Explanation: The appearance of a mixed pigment depends on the relative proportions of its component colours. Orange begins as a mixture of red and yellow; adding a little more yellow shifts its hue toward yellow while it remains orange. Thus option A, more yellowish orange, is correct. Adding blue would create a different, duller mixture, and the stated change does not directly produce green or violet.

Correct answer: B. Green will become more bluish and darker

Explanation: Green is produced by combining yellow and blue pigments. If the amount of blue is increased while yellow remains present, the mixture shifts toward a blue-green or bluish-green appearance. It may also look darker because the stronger pigment proportion changes the mixture’s visual intensity. Therefore option B is correct; adding blue does not turn green directly into orange or violet.

Correct answer: C. Reddish violet

Explanation: Violet is formed by mixing red and blue pigments. Increasing the red proportion shifts the mixture’s hue toward red, so it is described as reddish violet or red-violet. Consequently, option C is correct. More yellow would move a mixture toward a different warm hue, green requires yellow and blue, and bluish green is unrelated to increasing red in violet.

Correct answer: A. More yellowish

Explanation: In pigment mixing, the relative proportion of component colours influences the hue that is seen. Orange is made from red and yellow; if the mixture contains more yellow than red, the resulting orange shifts toward yellow and may be described as yellow-orange. It cannot become bluish or violet without blue, and grey is not the expected hue from this proportion change. Therefore option A is correct.

Correct answer: B. Blue

Explanation: Green is traditionally produced by mixing blue and yellow pigments. When the mixture appears more bluish than balanced green, the proportion of blue is greater relative to yellow. Red and orange are not the component colours of this mixture, and adding more yellow would shift the result toward yellow-green instead. Therefore option B is the only choice consistent with the observed hue.

Correct answer: C. Red

Explanation: In traditional pigment theory, violet is produced by mixing red and blue. If the mixture appears reddish rather than balanced violet, the red component is present in the greater proportion. More blue would shift it toward blue-violet, while yellow and green are not the two primary components responsible for making violet in this model. Thus option C correctly identifies the dominant colour.

Correct answer: D. Mixing all three primary colours in uncontrolled amounts

Explanation: The governing concept is controlled colour mixing. When all three traditional primary paints—red, yellow and blue—are mixed in uncontrolled amounts, several pigments absorb different wavelengths and the mixture loses clarity, often appearing brownish or muddy. Therefore option D is correct. A clean brush reduces contamination, keeping colours separate prevents mixing, and using a small amount alone does not cause muddiness.

Correct answer: D. Its brightness and intensity will decrease

Explanation: The governing concept is colour intensity, also called saturation or chroma, and its difference from colour category. Grey contains neutral value and reduces the vividness of yellow when mixed with it, so the yellow becomes duller and its brightness or intensity decreases. Therefore option D is correct. The mixture does not automatically become a secondary colour, and its basic yellow relationship is not completely renamed by this addition.

Correct answer: C. Mix red and yellow with a clean brush

Explanation: In traditional paint mixing, orange is a secondary colour produced by combining the primary colours red and yellow. A clean brush prevents traces of blue or other pigments from contaminating the mixture and making it dull or muddy. Blue and yellow produce green, red and blue produce violet, and mixing all three usually reduces clarity. Therefore, option C is the most suitable condition.

Correct answer: D. Mix blue and yellow on a clean palette

Explanation: The governing mixing rule is that green is a secondary colour made by combining the primary pigments blue and yellow. Using a clean palette keeps red, brown, or leftover pigment from contaminating the mixture and dulling its appearance. Red and blue produce violet, red and yellow produce orange, and adding black only darkens existing green. Hence, option D is the complete and most suitable process.

Correct answer: A. Red and blue with a clean brush

Explanation: Traditional subtractive paint theory identifies violet as a secondary colour formed by mixing the primary pigments red and blue. A clean brush helps preserve the mixture’s clarity. Yellow and blue produce green, while red and yellow produce orange. Blue and orange are complementary colours, so mixing them generally dulls the result instead of producing clean violet. Therefore, option A is correct.

Correct answer: B. Different proportions create different hues of the same mixture

Explanation: The governing concept is colour proportion: changing the relative quantity of two pigments changes the direction and intensity of the resulting hue. For example, more red with less yellow produces a red-orange, while more yellow produces a yellow-orange. Thus option B is correct. Option A ignores pigment behaviour, C applies only to dilution in some media, and D wrongly limits proportion to black.

Correct answer: C. More yellow and less blue

Explanation: In traditional paint mixing, yellow and blue combine to form green. If yellow is used in a greater proportion than blue, the green shifts toward yellow and becomes yellow-green, so option C is correct. More blue would create blue-green, equal quantities would give a more balanced green, and red with yellow would move toward orange rather than green.

Correct answer: D. More blue and less red

Explanation: Blue and red combine to form violet in a traditional colour wheel. When blue is present in a greater proportion than red, the violet shifts toward blue, producing blue-violet; therefore option D is correct. Red with yellow leads toward orange, yellow with blue leads toward green, and equal red and yellow also produces orange rather than violet.

Correct answer: A. A greater amount of red and a smaller amount of yellow

Explanation: Red and yellow combine to make orange. Increasing the red proportion shifts that orange toward red, creating a red-orange hue, so option A is correct. Yellow with blue produces green, and red with blue produces violet. The proportions matter because the larger share influences the direction of the intermediate colour on the colour wheel.

Correct answer: C. Gradually mix two selected primary colours on a clean palette

Explanation: To create a secondary colour cleanly, select the required pair of primary pigments, place them on a clean palette, and mix them gradually while observing the result. Option C is correct because this process controls both colour and proportion. Mixing all three can produce a dull muddy mixture, an unclean brush contaminates the colour, and adding black first changes value rather than producing a pure secondary colour.

Correct answer: A. The brush or palette was contaminated with blue

Explanation: The governing concept is pigment contamination during colour mixing. Red and yellow normally produce orange, but a trace of blue left on a brush or palette can dull the mixture because blue is opposite orange on the traditional colour wheel and neutralises its brightness. Therefore option A is the most likely explanation. The other choices deny the correct colour relationship or make an unsupported absolute claim.