Colour filling and blending

The governing concept is complementary colour interaction. Colours opposite each other on the colour wheel tend to reduce one another’s intensity when mixed, especially in paint. Adding a small amount of the complementary colour can therefore soften an overly vivid mixture and move it toward a muted neutral. Option A is correct. It does not make the colour white, wet the paper, or shape the brush tip; those actions require different materials or techniques.

The governing concept is the reduction of saturation when complementary paint colours are overmixed. Red and green are commonly treated as complementary colours; combining too much of both pigments absorbs more light and usually produces a muted, brownish or neutral-looking mixture. Thus option B is correct. The result is not normally brighter, pure blue, or white. The exact brown tone depends on the pigments and their proportions.

The governing concept is controlled value and hue mixing. Black can lower the lightness of a colour, but using only too much black may overpower its original hue and saturation, making the mixture look dull, muddy, or lifeless. Option A is correct. Black does not always increase brightness, does not automatically create transparency, and cannot stop paper from drying. A related dark hue may preserve more colour character.

The governing concept is colour temperature during shading. If a warm base colour is darkened with a related darker warm hue, its red, orange, or yellow character is more likely to remain visible while the value decreases. Therefore option B is the most suitable choice. Blue may cool or dull the mixture, white lightens it rather than darkening it, and water mainly changes transparency or flow instead of making a true darker shade.

The governing concept is gradual secondary-colour mixing. Yellow and blue are primary colours that combine in paint to produce green; as increasing amounts of yellow enter the blue, the mixture shifts from blue toward blue-green and then greener tones. Thus option C is correct. Purple requires red and blue, red is not produced by this pair, and black is not the expected result of a clean, controlled yellow-blue blend.

The governing concept is the result of mixing neighbouring paint colours in a transition. Red and blue pigments can produce a purple or violet mixture, especially when they meet directly without an intermediate warm colour. Therefore option D is correct. Green requires blue and yellow, orange is commonly made from red and yellow, and yellow cannot result from directly combining red with blue. The precise purple depends on pigment bias and proportions.

The governing concept is controlled colour lifting during a wet painting stage. A clean, slightly damp brush absorbs some of the excess pigment and gradually lightens the dark area without adding new colour. The brush should be rinsed and excess water removed between lifts. Adding black or thickening paint would make the area darker, while rubbing could damage the surface.

The governing concept is gentle lifting of pigment from a dry painted surface. Harsh rubbing can raise, scratch, or tear the paper fibres, leaving a rough patch that reflects light unevenly and accepts later colour poorly. A small highlight should be lifted gradually with light pressure using a suitable damp brush, tissue, or eraser. The other choices do not describe the main surface risk.

The governing concept is clean, controlled pigment removal. A damp brush picks up pigment from the painted surface; if it is not rinsed, the collected pigment remains in the bristles and may be transferred back during the next lift. This creates muddy spots and prevents even lightening. Rinse the brush after each lift, then blot away excess water. The other choices are not the purpose of rinsing.

The governing concept is consistency of brush direction in an even colour field. Strokes running in different directions can leave ridges, overlaps, and changes in pigment density. These marks catch or reflect light differently, producing uneven sheen and visible texture. A consistent direction, suitable pressure, and controlled overlap help create a more uniform background. The other options do not follow from changing stroke direction.

The governing concept in a flat wash is an even flow of diluted colour across the surface. If the brush moves too slowly, it may release excess liquid in one area, allowing pigment and water to collect there. This creates darker pools, back-runs, or an uneven wash. The artist should keep a steady controlled pace and manage the brush load. Slow movement does not automatically make the colour lighter, strengthen paper, or clean the brush.

The governing concept is continuous, adequately loaded brush movement in a wash. Moving too quickly can prevent the diluted colour from reaching and overlapping the whole area, so gaps and broken-looking strokes may remain. Load the brush appropriately and overlap adjacent strokes slightly while maintaining a controlled pace. Paint thickness depends mainly on the paint-water ratio and brush load, not speed alone; the other options are unrelated or absolute claims.

The governing concept is gentle correction of a wet painted layer. A clean brush, used with light touches, can break or remove surface bubbles while disturbing the underlying wash as little as possible. The brush should not be overloaded with water, and repeated scrubbing should be avoided. Hard rubbing damages the surface, adding paint increases the problem, and folding the paper can create creases or disturb the wet layer.

The governing concept is tonal gradation for atmospheric depth. A darker upper sky transitioning gradually to a lighter horizon creates a sense of open space and distance; the eye reads the smooth change as an expansive atmosphere rather than a flat block of colour. The transition should be blended without abrupt bands. This treatment does not erase clouds or aim to increase brush marks, and it creates depth rather than flatness.

The governing concept is atmospheric perspective: mist scatters light and reduces contrast, saturation, and edge clarity as distance increases. Therefore, a distant object should generally be painted with softer edges and lighter, less forceful tones so that it recedes visually. A sharp dark fill creates excessive contrast and brings the object forward. Distant objects are not always black, and the other choices do not explain the atmospheric effect.

The governing concept is tonal gradation: a gradual change from darker to lighter colour helps the eye read a rounded surface. When the centre is stronger and the colour becomes lighter toward the edge, the leaf appears curved and slightly raised rather than flat. Option C is correct. A flat fill removes form, colour identity is unrelated, and paper thickness cannot be shown through this blending.

The governing concept is tonal separation. Soft shadows, slight colour differences, and darker areas where petals overlap reveal each petal’s edge while preserving a natural appearance. Option D is correct because it creates depth without relying on artificial outlines. A thick black outline can look harsh, one flat colour removes separation, and darkening only the centre does not define the individual petals.

The governing concept is observing transparency and reflection. Glass does not receive or reflect light evenly: some areas show the background through the object, while highlights and reflected bands appear brighter or sharper. Therefore, option A is correct. A single uniform colour would hide these changes and make the glass look opaque or flat. The other options are absolute or unrelated claims.

The governing concept is strong light-dark contrast, supported by a small, sharp highlight. A bright mark placed beside a dark area imitates the concentrated reflection seen on polished metal, so option B is correct. A uniform mid-tone or equal brightness removes contrast and makes the object look dull. Only soft light colours produce a gentle surface, not a convincing metallic shine.

The governing concept is water-surface distortion. Ripples interrupt a reflected image into horizontal bands, and the water usually softens its edges and contrast. Thus option C is correct: broken, slightly blended horizontal colour segments suggest a reflection without copying the object exactly. A hard reflection ignores ripples, an exact copy looks unnatural, and leaving it uncoloured removes the reflected form altogether.

The governing concept is that brush direction and edge quality communicate movement. Calm water is suggested by long, smooth horizontal transitions, while fast water needs broken strokes that follow changing flow directions and create sharper interruptions. Option D is correct. Identical circular blending, black colour alone, or flat filling does not communicate the different speeds or surface movement.

The governing concept is consistency of colour across one continuous area. If the prepared mixture runs out, a second batch may contain slightly different pigment amounts, water, or concentration. Option C is correct because the new tone may form a visible patch or uneven join with the first one. Brush size, paper wetness, and picture dimensions do not automatically change merely because paint has run out.

The governing concept is control of the wet edge. Paint blends smoothly when neighbouring sections remain at a compatible stage of wetness. If one section dries before the next is joined, the new stroke may stop abruptly, producing a visible tide mark, hard edge, or uneven join. Option D is correct. Uneven drying does not guarantee a lighter colour, strengthen paper, or automatically improve the layer.

The governing concept is controlled blending and focal emphasis. A relatively soft, low-contrast background reduces competing edges and details, allowing the main figure to receive the viewer’s attention. It need not always be darker, because emphasis depends on the whole value and colour arrangement. A highly hard, detailed, or purely black background may compete with the subject rather than support it.

The governing concept is the wet-to-dry colour shift. Water, binder, and surface reflection can make a freshly applied colour look richer or darker while it is wet; after drying, the appearance may become lighter or less saturated. Thus option D gives the normal explanation. Brush size does not change during drying, black would generally darken the mixture, and a spontaneous paper-colour change is not the usual cause.