Acrylic colour

Correct answer: C. Acrylic adhesion may be weak on an oily and flexible surface

Explanation: The governing concept is compatibility and adhesion between painting layers. Acrylic is a water-based polymer emulsion and needs a clean, stable, non-oily surface to bond properly. An oil layer can remain oily and may move differently as it ages, so acrylic placed on top may not adhere reliably. Thus option C is correct. The other choices describe no real property of either medium; the practical layer order is generally acrylic first and oil afterward.

Correct answer: D. By scratching the wet upper layer with a pointed tool to reveal the lower layer

Explanation: Sgraffito is a subtractive layering technique. The artist applies one colour or ground, places another layer above it, and scratches or incises the upper layer before it becomes fully dry. The exposed marks reveal the contrasting lower colour and create the characteristic drawn texture. Option D is therefore correct. Spraying water, wiping everything away, or dipping the work in varnish does not selectively uncover the underlying layer.

Correct answer: A. Binding pigment particles and attaching them to the surface

Explanation: In paint technology, the binder is the film-forming medium that surrounds and holds pigment particles together and anchors the resulting layer to the prepared surface. In acrylic, the binder is an acrylic polymer emulsion that forms a durable film as the water leaves. Option A is correct. Pigment supplies colour, while fragrance, canvas transparency, and brush hardening are not the binder’s main functions.

Correct answer: B. Polymer particles join to form a continuous film

Explanation: Acrylic paint is an aqueous polymer emulsion containing pigment dispersed in water with acrylic polymer particles. As water evaporates, the particles move closer together, deform, and coalesce into a continuous polymer film that traps the pigment and adheres to the surface. Option B correctly describes this film-formation process. Pigments do not evaporate, water does not become oil, and normal drying does not melt the canvas.

Correct answer: A. Paint and glazing medium

Explanation: Acrylic glazing is based on applying a thin, transparent or translucent film so that the colour beneath influences the final appearance. A glazing medium extends the paint, distributes pigment smoothly, and supplies compatible binder, making option A the correct choice. Chalk powder and dry soil add opaque particles, while thick glue is not a controlled acrylic medium and may create an unstable or uneven film. Excessive water alone can also reduce binder concentration.

Correct answer: C. A dry brush with little paint touches mainly raised areas

Explanation: Scumbling is a broken-paint technique rather than a fully covering coat. The artist loads a relatively dry brush with a small amount of paint and drags it lightly across the surface. Paint catches mainly on raised texture, leaving gaps through which the lower layer remains visible. Option C is therefore correct. Complete transparency is not required, and the canvas does not push paint backward; dissolution in water would be a different process.

Correct answer: D. The risk of uneven drying and cracking decreases

Explanation: Impasto contains a substantial thickness of paint, so the outer surface can dry before the interior. Applying several controlled layers and allowing suitable drying time reduces the difference between surface and inner drying, improves adhesion between stages, and lowers the chance of cracking or later failure. Option D is correct. Layering does not make the paint immediately transparent, alter the painting’s size, or erase intentional brushwork.

Correct answer: A. Add a very small amount of its complementary colour

Explanation: The governing concept is saturation control. A complementary colour contains opposing colour information, so adding it in a very small amount neutralises intensity while changing value much less than adding white. White would lighten the mixture, water mainly changes fluidity and transparency, and heating does not reliably alter saturation. Add the complement gradually and test the mixture after each small addition to avoid a muddy result.

Correct answer: D. Lower contrast, soft edges and a cooler tendency

Explanation: Atmospheric perspective is governed by the way air and distance reduce visible detail, contrast, and edge sharpness. Distant mountains are therefore painted with softer contours, weaker value contrast, and often a cooler or bluer tendency than nearby forms. Sharp edges, heavy black outlines, intense warmth, and extra detail make the range appear closer. Thus option D gives the most believable depth cue.

Correct answer: A. Maintain paint moisture through a damp base in a covered environment

Explanation: The governing principle of a stay-wet palette is slowing evaporation from acrylic paint. A damp, absorbent layer beneath suitable palette paper supplies a humid environment, while a cover reduces exposure to moving dry air. This keeps the paint workable for longer, although it does not make it permanently wet. Heating and sunlight accelerate drying, and adding oil changes the medium rather than preserving it. Thus A is correct.

Correct answer: B. The paint may become over-diluted and lose binder balance

Explanation: The governing concept is the balance between acrylic pigment, water, and binder. A light mist can slow drying, but repeated heavy spraying adds excess water and may dilute the paint beyond its intended formulation. The pigment-to-binder balance can be disturbed, reducing adhesion, film strength, and covering power. It does not make paint more opaque, turn the palette metallic, or usually change hue permanently. Therefore B is correct.

Correct answer: D. Glass form depends on internal reflections, refraction and changing edges

Explanation: Transparent glass is understood through transmitted surroundings, refraction, selective reflections and varied edge strength, not through one continuous dark boundary. A uniformly dark outline makes the object resemble an opaque drawing and hides the light passing through it. Option D correctly identifies these visual cues. A, B and C contradict the nature of glass or the painting process.

Correct answer: A. The combination of paint consistency and applied force

Explanation: Splatter is governed mainly by fluid consistency and the force used to release it. Thinner paint and a stronger flick can break the liquid into smaller droplets and send them farther, while thicker paint and gentler motion tend to produce larger, heavier marks. Therefore option A is correct. Canvas price and palette colour have no physical control over droplet formation, and handle length alone is insufficient.

Correct answer: B. Apply a controlled thickness as directed and let it dry slowly

Explanation: Texture media dry by losing moisture, and an overly thick layer or rapid heating can create unequal shrinkage and internal stress. Applying the paste within the maker’s recommended thickness and allowing gradual drying gives the layer time to settle uniformly. Therefore option B is best. Hot air accelerates surface drying, excess water weakens the mixture, and bending a wet layer damages its structure.

Correct answer: C. Compatibility of layers and long-term adhesion

Explanation: Mixed-media work depends on how successive materials bond and age together. Before placing an oily or waxy medium over acrylic, the artist should check surface compatibility, the recommended order of layers, drying conditions, and whether the upper material will adhere permanently. Option C is correct. Colour choice alone cannot ensure stability, while brush price and the canvas name have no bearing on adhesion or conservation.

Correct answer: B. Do composition, values, edges, colour harmony, and focal point work together to clarify the subject

Explanation: A comprehensive critique examines how technique and design cooperate to communicate the subject. Composition, value structure, edge control, colour harmony, and the focal point should be considered together rather than judged in isolation. Option B is therefore correct. Equal quantities of colour are unnecessary, expensive tools do not guarantee quality, and eliminating every empty area can make a work crowded rather than effective.

Correct answer: C. Retarder medium

Explanation: The governing concept is control of acrylic drying time through a compatible medium. A retarder medium slows evaporation and keeps the paint workable for longer, allowing more time for blending and corrections. Therefore, option C is correct. Gesso prepares a surface, varnish forms a final coating, and an oil-based medium is unsuitable for normal acrylic paint.

Correct answer: D. Heavy gel medium

Explanation: Impasto depends on maintaining substantial paint thickness and raised texture. Heavy gel medium increases the body and volume of acrylic paint without making it runny, so brush or knife peaks can remain visible after application. Thus option D is correct. Flow improver and water make paint more fluid, while glazing liquid is intended for transparent thin layers.

Correct answer: A. The binder may weaken and adhesion may reduce

Explanation: Acrylic paint relies on an acrylic polymer binder to hold pigment together and attach the dried film to the surface. Excess water can over-dilute that binder, producing a weak, uneven film with reduced adhesion. Therefore option A is correct. Water cannot transform acrylic into oil paint, and excessive dilution does not inherently create a permanent dark or metallic surface.

Correct answer: C. Small and relatively dry

Explanation: Scumbling is a textural method in which a small amount of relatively dry paint is dragged lightly across a surface. The broken marks allow some of the underlying colour or ground to remain visible. Therefore option C is correct. A heavy flowing load would create an opaque wet stroke, watery paint would wash the surface, and varnish is not paint for scumbling.

Correct answer: B. Colour shift or drying shift

Explanation: The governing idea is that a paint colour can look different when its wet film becomes dry. In acrylics, the change may appear as a slightly darker or less glossy colour and is commonly described as a drying shift or colour shift. Therefore option B is correct. Colour separation, light diffraction, and oil absorption describe different phenomena and do not explain this normal acrylic change.

Correct answer: C. Interaction of mixtures with different densities and pouring additives

Explanation: In acrylic pouring, cell-like patterns commonly develop when layers or mixtures have different densities and contain suitable pouring additives. As the liquid films move, one mixture can rise through or separate around another, creating rounded cells. Thus option C is correct. A dry brush, missing gesso, or sunlight alone does not explain the fluid pattern formation.

Correct answer: A. To control luminous depth and the visual structure of colour

Explanation: Layering is a structural painting principle. A transparent layer allows underlying colours and light effects to remain visible, whereas an opaque layer covers them and establishes stronger shapes or highlights. Planning their order therefore controls luminosity, visual depth, colour interaction, and the hierarchy of forms. Option A is correct. Brush softness, canvas dimensions, and turning paint into paper are unrelated to the optical purpose of layering.

Correct answer: A. The binder may weaken and reduce adhesion

Explanation: Acrylic paint depends on an acrylic polymer binder to hold pigment particles together and attach the dry film to the support. Excessive water dilutes the binder relative to the pigment, so the resulting film may be weak, uneven, or poorly adhered, especially on a smooth surface. Option A is correct. Water does not convert acrylic into oil paint, and the other choices are not reliable consequences of over-dilution.

Correct answer: D. Create a permanent barrier between the painted surface and removable varnish

Explanation: An isolation coat is a clear, permanent protective layer placed over the finished acrylic surface before a removable varnish. Its governing conservation principle is separation: if the varnish later needs cleaning or removal, the paint film remains protected below the isolation coat. Thus option D is correct. It does not bleach the canvas, instantly dry the picture, or dissolve the colours into one another.