Colour filling and blending

The governing concept is the use of a controlled hard edge. When two colours must remain clearly separated, the painter should stop each colour at its boundary and avoid excess water or vigorous blending. This preserves a clean visual division, so option C is correct. Heavy blending and flowing wet paint soften or destroy the boundary, while dipping the paper cannot provide precise edge control.

The governing concept is gradual colour transition. A sky often changes gently across areas of light and colour, so light blending can remove abrupt bands and create a soft atmospheric appearance. Therefore, option D is correct. Hard black lines introduce sharp outlines, dots create a separate texture, and scratching removes or damages the surface rather than producing a smooth transition.

The governing concept is even coverage with boundary control. Good colour filling covers the intended area consistently, leaves no obvious blank or patchy sections, and stays inside the drawn outline. Therefore, option A is correct. Patchy work is incomplete, a colourless area has not been filled, and paint spreading beyond the boundary makes the result untidy. Both uniform application and clean edges are needed for a finished appearance.

The governing concept of blending is a gradual change from one colour or value into another. In successful blending, the transition is soft and the viewer does not see an unwanted harsh dividing line. Therefore, option B is correct. A hard line indicates an uncontrolled or deliberately sharp edge, white gaps show incomplete coverage, and seeing only one colour means no visible blending has occurred.

The governing concept is choosing a tool in proportion to the correction area. A small brush gives precise control, allowing the artist to place the matching colour only in the unfilled patch without disturbing the surrounding work. Therefore, option C is correct. Repainting the whole picture is unnecessary, erasing the boundary damages the shape, and dipping the paper gives no accurate control over the repair.

The governing concept is continuous, even coverage. Slightly overlapping brush strokes close small gaps between passes and distribute the paint more uniformly, producing a consistent surface. Therefore, option C is correct. Strokes placed far apart leave unpainted spaces, random directions can create uneven texture, and working only along the edges cannot fill the entire shape. Consistent pressure and direction also help maintain an even result.

The governing concept is precise boundary control during colour application. Small, controlled strokes let the artist reduce pressure and guide the brush accurately near the outline, so the paint remains inside the shape. Therefore, option D is correct. Excessive water makes paint run, very fast strokes reduce accuracy, and closing the eyes removes visual control. Careful movement near edges is especially important for a neat finish.

The governing principle is that the size of the tool should match the size and detail of the area. A small fine brush holds a manageable amount of paint and allows controlled strokes close to the edges, so option B is correct. A large sponge, wall brush, or large cloth is designed for broader coverage and may spread paint beyond the small shape or make the filling uneven.

Blending is governed by the principle of gradual tonal or colour change. The edge of one wet or softly applied colour should merge progressively into the next, without a sharp dividing line; therefore option C is correct. A sudden, hard transition leaves a visible boundary, a broken transition interrupts continuity, and black alone is not a blending method or required result.

A clear, continuous boundary defines the area that should receive paint and gives the artist a visual guide while working near the edges. Thus option A is correct because it helps keep colour inside the intended shape and produces a neat result. An outline does not automatically increase brightness, speed the drying of every medium, or alter the physical shape of a brush; those claims describe unrelated effects.

Water changes the working consistency of paint. When there is too much water, the mixture becomes thin and less controllable, so it can spread beyond the intended area, form runs, or leave uneven washes; therefore option B is correct. Excess water does not make paint thicker, cannot harden paper as a normal filling effect, and cannot change the physical size of the brush. Controlled moisture gives cleaner coverage.

Good colour filling requires enough paint on the brush to maintain a continuous layer across the surface. If the brush carries too little paint, its stroke may run out before the next stroke joins it, leaving gaps, streaks, or uneven coverage; therefore option C is correct. Too little paint does not automatically make the colour darker, create shine, or draw a boundary. Proper brush loading supports smooth, consistent application.

Wet paper and wet paint are vulnerable to excessive friction. Repeated rubbing can lift or roughen paper fibres, disturb the painted layer, and mix pigments too much, producing a muddy or dull appearance; therefore option D is correct. Rubbing does not reliably brighten colour, instantly soften brush bristles, or increase paper thickness. Light, deliberate strokes and adequate drying help protect the surface.

In art, gradation means a controlled, gradual change in value or intensity, such as moving from a light tone to a dark tone without an abrupt break. Therefore option A is correct. An outline defines an edge, cutting removes or separates material, and stippling creates tone through dots. These techniques may be used in artwork, but none names a smooth light-to-dark transition.

Blending depends on the colours remaining workable long enough for their edges to merge. When paint is still moist, gentle strokes can move and connect the adjacent colours, creating a softer transition; therefore option B is correct. Once paint has fully dried, blending becomes more difficult unless a suitable reworking method is used. A paint-free brush and folded paper do not provide the moisture or surface control needed for normal blending.

White gaps occur when adjacent brush or pencil strokes fail to meet, leaving parts of the paper uncovered. Consequently, option C is correct. Excessive pressure may damage the surface but does not necessarily create spaces; a light outline normally guides the filling, and keeping a brush in paint for too long does not itself leave white gaps. Connected strokes, careful edges, and even coverage prevent this problem.

Working with organised strokes in one direction helps distribute paint more consistently across the surface. As a result, the layer appears smoother, cleaner and more even, so option D is correct. Changing direction randomly can create visible streaks, uneven patches or overlapping marks. The technique does not change the colour name, reduce the picture size or prevent the brush from drying.

A hard boundary can be softened by using gentle back-and-forth strokes where the two colours meet. This gradually blends the transition without creating a new harsh mark, so option A is correct. A black line would make the boundary stronger, while cutting the paper or erasing all the colour removes the artwork rather than blending it. Light pressure is important for a controlled transition.

A brush that still contains the previous colour can contaminate the next colour and spoil the intended blend. The result may become muddy, dull or different from the planned tone, so option B is correct. Cleaning the brush removes leftover pigment and gives better control over the transition. It does not make the brush heavy, wet the paper or dry the paint; those are separate actions or effects.

Roundness is shown through gradual changes of light and dark, not through a flat colour or a thick outline. Smoothly blending a lighter area with a darker area creates a highlight, shadow and sense of volume, so option C is correct. A single dark colour gives a flat appearance, and a thicker outline only defines the edge. Leaving the fruit uncoloured cannot show its form.

Loading a brush with more paint than it can control may cause the paint to run or drip onto the paper. Excess paint can cross the outline, form unwanted patches and make an even layer difficult, so option D is correct. It does not guarantee an even spread, soften the bristles or increase the paper’s thickness. Removing extra paint at the palette edge improves control.

Using the same prepared mixture each time the brush is reloaded helps maintain a consistent hue, value and concentration across the background. Therefore, option A is correct. Changing the colour at every stroke creates visible variation, a completely dry brush may leave rough or incomplete marks, and folding the paper does not control the paint layer. Preparing enough matching mixture also reduces patchiness.

The governing concept is shade formation in colour mixing. Adding a very small amount of black lowers the lightness of the original colour and produces a darker shade, so option C is correct. White would make the colour lighter, water mainly changes paint fluidity or transparency, and yellow changes the hue rather than reliably darkening it. Black should be added gradually because too much can make the mixture dull or muddy.

The governing concept is controlled colour mixing. When two or more colours are worked together excessively, their pigments can lose visual clarity and the mixture may become dull, greyish, or muddy. Therefore, option D is correct. Overmixing does not automatically make colours brighter, completely transparent, or white; those effects depend on the particular medium and pigments. Artists usually stop mixing once the intended transition or colour is achieved.

The governing skill is creating a smooth transition between neighbouring colours. Drawing two colour bands and gradually merging them in the middle gives direct practice in controlling pressure, paint quantity, and brush movement. Thus, option A is correct. Cutting paper, leaving a brush in water, and sharpening a pencil may be useful in other situations, but none of them develops the blending action itself. The exercise can be repeated with light and dark versions of related colours.