Colour mixing

The governing concept is additive mixing in the RGB light system. When blue light and green light are added, their wavelengths stimulate the eye together and the perceived result is cyan. Yellow requires red plus green light, while violet and orange are not the result of this RGB pair. Thus option A is correct. This rule applies to emitted light such as pixels, not ordinary paint mixtures.

Mixing two primary pigments in approximately equal amounts gives the two components similar influence, so it can produce a clear, balanced secondary colour. For example, equal red and yellow can make orange, while equal yellow and blue can make green. The exact result depends on pigment strength, so “may be obtained” is precise. Equal mixing does not always produce black, erase colour or change paper thickness.

A useful assessment should test both the process and the concept. Mixing two primary colours demonstrates the process, while naming the resulting colour demonstrates classification. For instance, red plus yellow gives orange, yellow plus blue gives green, and blue plus red gives violet in the traditional pigment model. Counting colours, drawing unrelated lines or measuring a brush does not test secondary-colour knowledge.

Green is produced by mixing yellow and blue. If the mixture contains a greater proportion of yellow, its hue shifts toward yellow and it appears yellowish green; therefore, option A is correct. Bluish green would result when more blue is used. Red and violet are not the components of this particular mixture, so the other descriptions do not follow the stated colour proportion.

Green is a mixture of yellow and blue. When the proportion of blue is increased, the resulting hue shifts toward blue and is described as blue-green, so option B is correct. Yellow-green would indicate a greater proportion of yellow. Red-green and orange-green do not describe the direct effect of adding more blue to the standard yellow-and-blue green mixture.

Orange is formed by mixing red and yellow. If more red is added or red is present in the greater proportion, the orange hue moves toward red and appears reddish orange. Thus, option C is correct. Yellowish orange would result when yellow dominates. Green and blue are not the component colours in this standard orange mixture, so the remaining options are unsuitable.

In the traditional artist’s colour wheel, violet is a secondary colour formed by mixing the primary colours red and blue. Of those two components, red is commonly classified as the warm primary colour, whereas blue is generally treated as cool. Yellow is also primary but combines with blue to make green; green is secondary and black is not a primary colour in this system. Therefore, red is correct.

Green is produced by mixing the primary colours yellow and blue in the traditional subtractive art colour wheel. Between these two ingredients, blue is commonly described as the cool primary colour, while yellow is usually treated as warm. Red would combine with yellow to make orange, and orange is already a secondary colour. Thus blue is the correct cool primary colour used to make green.

On the traditional RYB colour wheel, mixing red and blue produces violet, a secondary colour. The other combinations lead to different results: yellow and blue make green, while red and yellow make orange. Green and yellow usually produce a yellow-green or other intermediate mixture rather than violet. The exact appearance depends on pigment quality and proportions, but red plus blue is the standard school-art answer for a violet flower.

Adding white to orange increases its lightness, or value, and produces a lighter version called an orange tint. The hue remains in the orange family; it does not turn into green or blue. In art terminology, white creates a tint, whereas black generally creates a shade by making a colour darker. Therefore, among the choices, light orange accurately describes the result of adding white to orange.

Adding black generally lowers the value, or lightness, of green, so the mixture appears darker. In colour theory this darker version is called a shade. Black does not change green into red or yellow by itself, because those hues require different pigments; adding white would move green in the lighter direction and create a tint. Thus the main expected effect is that green becomes darker.

When black is added to orange pigment, the colour’s value or lightness generally decreases, producing a darker orange shade. A tint is the lighter version made by adding white, so option B describes the opposite operation. Orange does not become green merely because black is added, and it remains a secondary colour rather than becoming primary. Therefore, the darker shade of orange is the correct result in standard colour theory.

Adding white increases the lightness, or value, of a secondary colour and produces a tint. For example, white added to orange creates light orange, and white added to green creates light green. The colour remains in its original family and does not become a primary colour. Black generally produces a darker shade instead, so options B and D describe the opposite effect. Hence secondary colours become lighter when white is added.

A clean palette is the proper surface for mixing paints because it allows the artist to control the quantity and proportion of each colour. It also prevents unwanted dirt or leftover pigment from changing the mixture, so option A is correct. The back of paper, scissors, and a dry cloth are unsuitable surfaces: they do not provide safe, clean, or reliable control over the paint mixture.

In traditional subtractive art colour mixing, orange is a secondary colour made from the primary colours red and yellow. Mixing these two paints thoroughly and in a controlled proportion distributes the pigments evenly and produces a cleaner orange, so option A is correct. Blue and green do not make orange, while mixing all three primary colours often produces a dull, muddy result. Water alone adds no orange pigment.

According to the traditional paint colour wheel, red and blue are primary colours. Mixing them produces violet, also called purple, so option B gives the correct correction. Green is made by mixing yellow and blue, whereas orange is made by mixing red and yellow. The result can vary slightly with pigments, but the standard school-art relationship tested here is red plus blue equals violet.

In the standard school colour wheel for paint, yellow and blue are primary colours. Their mixture produces the secondary colour green, so option A is correct. Orange is not produced by this pair; it results from mixing red and yellow. Violet results from red and blue, while red itself is a primary colour rather than the mixture being asked about. Thus the student’s label should be corrected to green.

Option A is correct because orange is formed from red and yellow, and adding a greater proportion of yellow moves the mixture toward yellow. The resulting shade is therefore yellowish orange. Reddish orange would require more red, not more yellow. Greenish and violet shades involve different colour relationships and are not produced simply by increasing yellow in a red-yellow mixture. This illustrates the general mixing principle that the dominant component gives the mixture a stronger visual tint.

Option B is correct. Green is commonly produced by mixing yellow and blue, so increasing the amount of blue shifts the mixture toward blue and creates bluish green. Yellowish green would result if yellow were increased instead. Red and orange are not the components being adjusted in this mixture, so the other choices do not describe the expected colour change. The governing concept is that the dominant pigment contributes the stronger tint to a mixed colour.

Violet is produced by mixing red and blue. If the quantity of blue is increased, blue becomes the dominant influence in the mixture, so the violet shifts toward a bluish appearance. Therefore, option B is correct. More red would create reddish violet, while yellowish or greenish violet is not the expected result of adding blue to a red-blue mixture. This illustrates colour mixing and relative colour dominance.

Violet is formed by combining red and blue. When more red is added, the proportion of red increases and the mixture develops a stronger red bias, appearing as reddish violet. Thus, option B is correct. Bluish violet would result from adding more blue. Yellow and green are not the expected dominant directions in this red-blue mixture. The governing idea is that the colour present in greater proportion usually gives the mixture its visible tint.

In colour mixing, adding white to an existing colour produces a tint. The colour becomes lighter while remaining in the same colour family; for example, white added to orange creates a lighter orange or peach-like tint. A shade is darker and is generally made by adding black. White does not convert a secondary colour into a primary or complementary colour, so option A is the only correct answer.

Adding white to orange reduces its visual intensity and increases its lightness, producing an orange tint. Depending on the proportion of white and the pigment used, it may look like light orange or a peach-like colour. It cannot become dark blue, pure green, or black because white lightens the starting colour rather than changing it into an unrelated hue. Thus option A is correct.

Adding black to a secondary colour lowers its lightness and creates a darker version called a shade. For example, adding black to green produces a darker green. This process does not create white, a primary colour, or a complementary colour, because those are different colour results requiring different pigments or relationships. In contrast, adding white creates a tint, so option A correctly describes the effect.

Black added to green produces a darker shade of green because black reduces the colour’s lightness and usually its apparent brightness. It does not make green lighter; white would create a tint instead. Nor does black alone change green into yellow or white, since those outcomes require different colours or mixing conditions. Therefore, the governing colour-mixing rule clearly supports option A.