Brush techniques

Cross-brushing builds surface texture by placing a second set of marks across the first without destroying the original direction. Letting the first layer settle and applying limited, light crossing strokes preserves both patterns, so A is correct. Hard scrubbing, circular repetition, or a thick opaque coat buries the first texture and may muddy the colour.

The governing concept is that brush direction and broken marks communicate surface texture. Water reflections are vertically related to the object, but small horizontal interruptions suggest ripples and prevent the reflection from appearing like a solid wall. Therefore, option B is correct. Continuous vertical bands look rigid, removing reflections destroys the effect, and darkening only the boundary does not model water.

The governing concept is atmospheric perspective: distance reduces apparent size, contrast, and detail. With the same fan brush, use lighter, smaller, less separated marks for distant grass, while nearby grass should have clearer, longer, individually visible strokes. Thus option C correctly combines scale, tone, and edge control. Equal marks flatten space, reversing the treatment is incorrect, and a black outline looks artificial.

The governing concept is consistent pigment concentration during a broad wash. If a mop brush carries most of its mixture at the beginning and is not reloaded with an equally strong mixture, the upper strokes receive more pigment and the lower strokes become pale. Therefore option D is correct. A flat sheet, a clean brush, or the colour name does not explain this concentration gradient.

The governing concept is tonal modelling: a rounded object needs a gradual value change from the light side through the middle tone to the shadow side. Form-following strokes support the contour, but direction alone cannot show volume. Option A supplies the missing transition. Equal darkness removes modelling, a heavy outline creates a flat symbol, and dots do not establish curved form.

The governing concept is edge variety. A focal form needs selected firm or hard edges to separate important planes from the background, while soft or lost edges can remain elsewhere to preserve depth and avoid a cut-out appearance. Therefore option B is best. Blurring everything weakens the form, a complete black outline looks artificial, and erasing the background is unnecessary.

The governing concept is contact-width control. A flat brush makes a wider mark when the painter gradually increases pressure or tilts the edge, because more bristles touch the surface. Hence option C identifies the actual fault. Paint value and paper size do not determine this progressive width change, and the handle colour is irrelevant to the stroke.

The governing concept is even loading and full-width contact. When the centre of an angled brush has too little paint or is lifted from the surface, pigment transfers mainly from the two edges, leaving a blank middle. Thus option D is correct. Dark paint changes value, a dry surface is not the specific cause, and a short stroke can still be fully covered.

The governing concept is selective highlight control. Metallic shine depends on sharp, limited light accents against a darker base; spreading pale dry-brush pigment evenly removes the value contrast and produces a chalky coating. Option A restores contrast by reserving light colour for reflective zones and retaining some clear edges. Options B and C spread the problem, while water flooding is unsuitable for controlled dry-brush highlights.

The governing concept is controlled irregularity in natural mark-making. Real branches show small changes in direction, pressure, taper, and thickness rather than a mechanically uniform line. Option B introduces these variations while retaining control, making the branch more believable. A perfectly straight line looks artificial, outlines add stiffness, and equal lengths ignore natural growth patterns.

The governing concept is pigment pooling, often called a dark edge or back-run effect. As the wash dries, liquid and pigment migrate or collect toward a boundary; when the water evaporates, more pigment remains there, creating a darker rim than the centre. Therefore option C is correct. A dry brush or no water would not create this pooling pattern, and paper thickness is not the likely cause.

The governing concept is variable control and cause-and-effect analysis. If the final mark is recorded without pressure, moisture, and brush angle, several conditions could have produced the same result. Therefore, the observer cannot identify which factor caused a dark, broad, or broken stroke. Option B is correct; brush price, drying, and paper colour do not explain the missing experimental information.

The governing concept is even paint distribution in a wash. Constant movement speed alone does not guarantee an even tone: a brush carrying more pigment, a tilted surface, or liquid pooling can make selected areas darker. Option D identifies the relevant technical causes. The paper title, artist’s name, and handle decoration cannot change how pigment spreads across the surface.

The governing concept is combining marks at different visual scales to describe texture. A dry brush leaves broken, irregular passages that can suggest broad worn areas, while stippling creates many small dots resembling pits, grains, or pores. Option A is correct because the methods complement each other. The other choices incorrectly describe them as smoothing, transparent-wash, or edge-equalising techniques.

The governing concept is that marks should describe form and planes, not merely cover an area. A rock has changing faces that catch light differently, so dry-brush direction, length, density, and tone should respond to those planes. Option B restores a sense of volume. Removing marks, darkening only the outline, or applying one flat wash would not explain the rock’s changing surface.

The governing concept is edge quality and tonal transition in material rendering. Flexible fabric usually has gradual changes of light and shade, with some folds merging softly rather than being enclosed by hard lines. Option C creates this softness while preserving a few clearer edges for structure. Sharpening every edge, outlining every fold in black, or making strokes uniform would make the fabric look rigid and artificial.

The governing concept is material description through the way each surface handles light. Metal commonly shows strong, sharp value changes and reflected surroundings, whereas glass is suggested by transparency, visible inner edges, overlapping forms, and selective highlights. Option D therefore distinguishes the materials through brush marks and light behaviour. Identical bands, no highlights, or a changed colour label cannot communicate these surface properties.

The governing concept is controlled brush pressure and contact area. Fine detailing normally uses the tip with light, steady pressure. If pressure suddenly increases, the belly of the brush touches the paper and releases the stored paint, creating an unwanted blob or pool. Option C is correct. A clean brush, light paper, or completely dry paint would not explain a sudden release of wet colour from the belly.

The governing brush-care concept is that paint must be removed from the bristles up to the ferrule. Dried paint hardens the roots, separates individual hairs, and prevents them from flexing and gathering into one fine point. Therefore option D correctly identifies the mechanical cause. Handle weight, colour darkness, and paper smoothness do not normally split a brush tip in this way.

Proper drying is part of brush-care technique. Heat can make natural bristles curl, become brittle, or lose their intended shape, while placing a wet brush bristle-down allows water to remain near the ferrule and weaken the adhesive or joint. Option A combines both realistic forms of damage. The other choices describe changes that are unrelated to drying position and temperature.

The governing concept is colour purity during a change of painting technique. Transparent-wash residue can mix with the next opaque colour, while excess water dilutes its binder and pigment. The brush should therefore be rinsed thoroughly, blotted so it is damp rather than dripping, and then loaded with the new paint. Option B gives this complete preparation; the other options preserve or increase contamination.

A medium’s drying speed determines its open or workable time. If paint dries too quickly, a soft blend may become streaky and edges may set before they can be adjusted; if it dries slowly, a crisp edge may spread or merge unexpectedly. Option A correctly describes this timing problem. Brush price, a paper label, and total colour identity are not consequences of drying speed.

The governing concept is a controlled experiment: change one independent variable while keeping other relevant conditions constant. To study pressure, the brush, colour, moisture, paper, and movement speed should remain comparable, while pressure alone is varied. The resulting differences in line width, opacity, or deposited colour can then be attributed to pressure. Therefore option A is correct; the other choices introduce confounding variables.

The governing concept is edge control during wet blending. Excess water, a heavy paint load, or pausing at the boundary allows pigment to pool and travel into the subject. Keeping the area near the edge less wet and using short, controlled strokes limits capillary spreading while preserving a clean contour. Option A is correct. More water, pre-wetting the subject, or depositing extra paint would increase bleeding and pooling.

The governing concept is matching brush capacity and width to the area being painted. A small brush covers less surface and carries less liquid, so a large wash requires many separate strokes and joins. Those joins may begin drying at different times, creating visible bands or streaks. Option C is correct. Brush size does not automatically determine colour darkness, and a small brush can hold water and be used for wet paint.