Acrylic colour

The governing concept is paint flow and leveling. A flow improver helps acrylic paint move more freely and spread more evenly, so a thin wash can settle with fewer visible brush marks when applied correctly. Option B is therefore correct. Heavy modelling paste adds body and texture, dry gesso is a ground rather than a wet-paint additive, and oil varnish is not the appropriate medium for improving an acrylic wash.

Sgraffito is governed by the principle of subtractive mark-making: an upper layer is scratched, scraped, or incised so that a contrasting colour or ground beneath becomes visible. With acrylic, the timing and condition of the upper layer affect the mark. Option C is correct; spraying water, dipping cloth, or heating varnish does not create the characteristic scratched reveal.

The governing concept is surface sheen control. Matte medium or matte varnish contains ingredients that reduce reflected gloss and helps produce a more consistently low-sheen finish across an acrylic painting. Option D is correct. Extra gloss gel increases shine, metallic powder changes the visual effect rather than giving a uniform matte finish, and oil-based varnish is not the suitable acrylic finishing choice here.

The governing concept is tonal planning. A monochromatic underpainting uses one colour or a restricted value range to establish the main lights, midtones, and darks before additional hues are added. Option A is correct because it clarifies form and value structure. It does not permanently control transparency, change canvas flexibility, or serve as a brush-cleaning method.

The governing concept is coverage: opacity increases when pigment blocks the underlying surface. Using an inherently opaque pigment or building several controlled acrylic layers gives more even coverage as each layer dries. Option B is correct. Excessive water makes paint more transparent, transparent glazes preserve underlying visibility, and wiping removes rather than strengthens coverage.

The governing concept is selective contact in dry-brush application. Because the brush contains relatively little fluid paint, the raised parts of a rough surface catch the pigment while recessed areas remain partly unpainted. This produces broken, grainy strokes, so option C is correct. Complete flowing requires wetter paint, and the other choices do not describe the technique’s surface effect.

The governing conservation concept is separation of layers. An isolation coat forms a clear intermediate barrier over the cured acrylic paint, helping protect the paint film if a removable final varnish later needs cleaning or replacement. Option D is correct. It does not cut the canvas, instantly dry paint, or convert acrylic into oil colour; those functions are unrelated.

The governing concept is controlled reflection. Metallic particles need to be distributed evenly, while the direction of strokes should support the intended light direction so the surface reflects light consistently. Option A is correct. Excessive water can weaken coverage, soil contaminates the paint film, and unmixed lumps create irregular texture rather than a controlled metallic sheen.

The governing material principle is compatibility between the paint film and its support. A very thick acrylic layer can become relatively rigid, while an unstable or overly flexible surface moves underneath it; this mismatch creates stress and may cause cracks. Option B is correct. Thin flexible layers, a clean palette, and suitable gesso generally reduce risks rather than cause this failure.

The governing concept is drying control. Acrylic paint normally dries quickly because water evaporates from its water-based polymer emulsion. A retarder slows that evaporation and extends the open working time, allowing more careful blending and correction. Option A is correct. It does not permanently make paint opaque, harden the canvas, or transform paint into metal.

The governing concept is final surface finishing. A suitable acrylic varnish forms a consistent protective film that can even out differences between glossy and matte passages, producing a more uniform sheen after the painting has dried. Option B is correct. Gesso prepares a ground before painting, charcoal is a drawing material, and fixative powder is not the normal final finish for an acrylic painting.

The governing concept is proportional use of painting mediums. Retarder extends acrylic working time, but an excessive amount can slow water loss too much and interfere with proper film formation. Consequently, the layer may remain tacky, weak, or slow to cure. Option D is correct. The paint does not become stone, oil paint, or white pigment merely because too much retarder was added.

The governing concept is a toned or coloured ground. Beginning over a prepared colour removes the distracting blank-white effect and gives the composition an initial middle value and colour relationship. This can unify later passages while still allowing lights and darks to be built. Option A is correct. A ground does not automatically create complementary colours, prevent shadows, or make every layer transparent.

The governing concept is controlled masking removal. When the acrylic is touch-dry but not excessively hardened, pulling the tape slowly back over itself at a low angle reduces upward stress on the paint film and leaves a cleaner edge. Option C is correct. Leaving tape for days, applying a thick layer, or soaking it can increase lifting, bleeding, or surface damage rather than preventing it.

The governing concept is differential drying and film stress. In an excessively thick acrylic layer, the surface can dry and contract while moisture remains deeper inside. Uneven contraction places stress on the film and may produce fine cracks. Option D is correct. Properly dried thin layers, a suitable flexible support, and an appropriate medium generally reduce this risk rather than cause it.

The governing concept is modifying acrylic paint while preserving its polymer binder. A compatible polymer medium can improve flow, increase transparency or extend volume, and alter gloss without stripping away the binding system that forms the paint film. Option A is correct. It does not remove the binder, turn all paint white, or permanently stop drying; those effects misunderstand the role of a medium.

The governing concept is atmospheric perspective. Air between the viewer and a distant object reduces clarity, contrast, and often apparent colour saturation, while cooler and lighter tones suggest haze. Option B is correct because reduced contrast, detail, and warmer intensity makes distance convincing. Strong contrast, heavy texture, or pure black usually brings an object forward instead of pushing it into the background.

The governing watercolour principle is pigment concentration. If the artist repeatedly adds water without adding a matching amount of pigment, the mixture becomes increasingly dilute. The first part of the wash contains more pigment, while later strokes contain less, so later areas appear lighter and more transparent. Option D is correct; adding water does not increase opacity or maintain an equal tone. Option C reverses the likely progression described.