Poster colour

Opacity means that a paint layer blocks or greatly reduces the visibility of the surface beneath it. The practical advantage of poster colour is therefore its covering power: it can hide the paper, an earlier layer, or a small painted mistake when applied evenly. Option A states this property correctly. Transparency is associated more strongly with thin watercolour washes, while the other choices do not describe opacity or normal drying behaviour.

The governing colour concept is saturation and value. Adding excessive white lightens a mixture and reduces its saturation, so the dried layer may appear pale, powdery, or chalk-like instead of rich and clear. Therefore, option B is correct. A small amount of paint may cause weak coverage, and dark paper can affect appearance, but neither specifically explains the chalky effect as directly as too much white; a clean brush is not a cause.

The governing concept is complementary colour mixing and controlled neutralisation. Orange lies opposite blue in the colour wheel, so a very small amount can reduce blue’s excessive brightness and make it appear deeper and more natural. Option A is therefore correct. White raises lightness, yellow shifts the hue toward green, and light green usually makes the mixture lighter or more greenish rather than naturally dark blue. Too much orange may produce a muddy or brown result.

The governing technique is controlled layering. Although the lower poster-colour layer feels dry, excess water can soften its binder and repeated pressure or rubbing can lift and mix it into the new white mark. Therefore, option C is correct. The whiteness, paper size, or highlight size does not cause the underlying layer to be disturbed. A relatively opaque, thicker white application with limited strokes protects the base.

The governing concept is that perceived colour depends not only on the mixture but also on application and viewing conditions. A thicker or thinner layer, a different paper surface, and different illumination can alter saturation, value, texture, and apparent hue between a wet or dry sample and the final background. Thus option B is correct. The title, brush name, and palette size do not directly determine this visual difference.

The governing concept is integrated assessment: technical skill includes preparation, even filling, brush control, edge accuracy, lettering, and value modelling. Option B combines these requirements in one finished poster, so it gives the broadest assessment. Naming colours tests knowledge only; washing brushes tests maintenance, and filling one circle measures only a limited part of the technique. Both process and visual result can be judged.

The governing concept is paper-fibre protection during wet painting. Excess water enters and swells the fibres, while repeated brushing abrades the softened surface; together these actions weaken the sheet and can cause tearing beneath a heavy layer. Thick paper is generally more resistant, a light dry-brush layer adds little moisture, and proper palette mixing prevents over-wet application. Therefore, option A identifies the technical error.

The governing concept is value modelling: lightness and darkness explain how planes turn in space. With one hue, the face receiving the most light can be light, the side receiving less light can be mid-value, and the face turned away can be dark. This orderly sequence separates the planes and suggests volume. One value flattens the cube, unrelated bright colours weaken unity, and an outline alone cannot show surface lighting. Thus B is correct.

The governing concept is gradual value modelling. On a rounded raised form, light turns progressively across the surface, so the painting should move from the light area through a middle value toward the shadow. The middle value is essential because it connects the light and dark and makes the surface appear curved. An abrupt white-to-black jump looks harsh, one value flattens the form, and an edge alone cannot describe roundness. Therefore B is correct.

The governing concept is opacity, or covering power. If a lighter upper layer is thin or weakly pigmented, it cannot conceal the darker underlayer, so the lower colour changes the apparent result. A more opaque mixture, a suitably dry first layer, or a light base can improve coverage. The effect does not prove colour stability, better brush control, or loss of paper texture. Hence insufficient covering power, option A, is correct.

The governing concept is the relationship between consistency, pigment concentration, and opacity. When excessive water spreads a small amount of pigment over a larger area, fewer particles remain on each part of the surface, so the lower layer shows through even though the paint itself is opaque when sufficiently concentrated. Option A is correct; the pigment does not disappear and the brush or paper does not create this effect.

The governing concept is controlled layering in opaque poster colour. Although the lower layer is dry, excess water can soften or reactivate its binder, and repeated brushing adds friction that lifts the pigment. Therefore, option A is correct. The first layer being clean, the brush being small, or the paper being white does not normally disturb a properly dried layer. Use a moderately thick mix, wait for drying, and apply the next coat with few gentle strokes.

The governing concept is uniform surface treatment. A small correction patch can differ from the surrounding dried paint in colour value, opacity, edge, and texture, so several local repairs remain visible. Option B is best because repainting the complete related shape with one consistently mixed layer unifies the surface and hides correction boundaries. Different consistencies exaggerate variation, rubbing may lift paint, and a black edge does not solve the tonal mismatch.

The governing concept is chromatic shadow mixing: shadows need reduced lightness without destroying the hue relationship. A very small amount of a cool, dark neighbour such as blue or green can deepen and mute red while preserving a coloured shadow, so A is correct. White creates a tint, water mainly changes consistency, and extra yellow shifts red toward orange rather than producing a natural dark red.

The governing principle is that a shadow is affected by local colour, surrounding light, and warm–cool temperature, not merely by blackness. Applying identical black to every object suppresses hue differences and makes all forms appear equally heavy, so A is correct. Paper size, brush-washing time, and letter height may affect other aspects of an artwork, but they do not explain the loss of varied shadow colour in this example.

The governing concept is complementary correction through small, measured additions. Orange is strongly influenced by red and yellow, so a tiny amount of blue or a cool neutral can reduce its excessive warmth. The quantity must remain small because too much blue can produce a dull or greenish mixture. More red or yellow increases the orange warmth, while white only raises the value and makes the colour lighter without properly correcting its hue. Therefore, option A gives the most controlled result.

The governing concept is separating value from chroma. Since the value, or lightness, is already correct, the correction should add a small amount of a suitable warm hue without substantially changing lightness. A little pure red or yellow restores colour vitality and reduces the dull grey appearance. More grey, complementary colour, or black would generally make the mixture duller or darker and could disturb the correct value. Therefore, option A is the most controlled choice.

The governing concept is the visual depiction of material and reflected light. Metallic surfaces usually show sharp transitions between bright highlights, middle tones, and dark areas, together with reflected colours from their surroundings. A single white stripe supplies only one highlight and does not establish the surrounding value contrast or reflected environment needed to suggest metal. The other options describe false technical claims. Hence option A is correct for poster-colour rendering.

The governing concept is controlling dry-brush friction and paint load. When the brush carries too little paint and is pressed too firmly, its bristles drag across the surface, producing harsh, broken marks and an excessively rough texture. A controlled result needs a moderate paint load and light, steady pressure. A clean brush or flat paper does not by itself create this problem, while sufficient water reduces dry-brush roughness rather than causing it. Therefore, option A is correct.

The governing concept is consistent brush contact. With a flat brush, keeping the angle and applied pressure steady keeps the same part of the brush edge against the paper, so the stroke remains approximately uniform in width. Changing the angle alters the contact area, and changing pressure can spread or narrow the stroke. Water affects flow and drying, but does not alone guarantee width; letter spacing and paper orientation are unrelated. Therefore, option A is correct.

The governing concept is smooth paint-flow control during lettering. Excess paint and pausing at a turn allow wet colour to collect in one place, making that section visibly darker and thicker. Loading the brush with less paint and maintaining continuous, even movement prevents accumulation while preserving the stroke. Adding water at the turn may cause spreading, stopping increases the deposit, and black deliberately worsens the dark patch. Therefore, option A is the suitable correction.

Technical review should move from the material to the visible finish. First check whether the paint has suitable consistency; then inspect whether layers are even, whether edges are clean, and finally whether colour contrast supports clear viewing. Option A gives this complete sequence. The other choices examine only one superficial feature and cannot reveal uneven paint, rough edges, or poor readability.

High-quality poster-colour work depends on a controlled workflow rather than a single colour choice. Planning establishes layout, test samples reveal drying behaviour, sufficient mixture maintains consistency, controlled layers protect the surface, and final review checks edges and readability. Option A is therefore the comprehensive strategy. The other choices create inconsistency, damage wet layers, or restrict design without solving technical problems.

The governing concept is consistency across the entire painted area. A uniform mixture, similar brush load, and controlled layer thickness prevent some strokes from appearing lighter, darker, wetter, or more opaque than others. Option A is correct because all three factors work together. Paper colour and brush size alone are insufficient, while a new mixture for every stroke may introduce value differences rather than remove them.

The governing concept is saturation and the change in appearance that can occur as paint dries. If the hue is correct but the mixture looks dull, adding a small amount of the original base hue can strengthen its colour identity. A dry test is important because the wet mixture may look different. Much white lightens and weakens saturation, black reduces brightness, and excess complementary colour can neutralise the mixture further.