Contrast in miniature painting: dark lining, NMM, and the squint test

Painters distinguish three primary types of contrast that work on miniatures: value contrast, hue contrast, and saturation contrast. Each contributes something different, and they are not interchangeable.

The squint test is the simplest available diagnostic for contrast on a miniature. Hold the model at arm's length (approximately the distance from which it will be viewed during a game) and slowly narrow your eyes until you are looking through half-closed lids. This defocuses the image and removes fine detail, showing you only the broad value pattern of the miniature.

What you should see: distinct dark areas, distinct light areas, and a clear separation between the different major elements of the figure (armour, cloth, face, weapon). The shadow areas should be visibly darker than the base areas, and the highlights should be visibly brighter than the base areas.

What indicates insufficient contrast: areas that blur together at this defocused view. If the armour and the cloth become indistinguishable from each other, they share too similar a value. If the face disappears into the hood, the face needs brighter highlights or the hood needs darker shadow. If the entire miniature reads as one undifferentiated value, the highlights need to be pushed brighter and the shadows pushed darker.

The squint test is useful at every stage of painting. Running it after base-coating, after shading, and after highlighting allows you to catch and correct contrast problems before completing each stage rather than after.

Dark lining (also called black lining or recess lining) is the technique of applying a thin line of dark paint along the border between two different colour areas: at the join between red armour and brown leather, a thin dark line; at the seam between blue cloth and gold metal trim, a thin dark line; at the gap between separate armour plates, a thin dark line.

The effect is visually significant and technically achievable by any painter with a fine-tipped brush. The dark line separates adjacent elements even when their values are similar, dramatically improving the readability and crispness of the model. It is the technique most directly responsible for the "clean" look of competition-level miniatures, the sense that each element of the figure is crisply distinct from its neighbours.

The most common approach is to use a very dark paint (near-black, dark grey, or a very dark version of one of the adjacent colours) thinned to a manageable consistency and applied carefully along the boundary with the tip of a fine detail brush. The line does not need to be perfectly straight; it follows the sculpted geometry of the model. What matters is that it is consistent, not too thick, and that it reaches into every significant boundary.

Dark lining is particularly valuable at small scale precisely because details visible at hand-holding distance disappear at arm's length. The dark line maintains the separation between colour areas even at the blurring distances of tabletop viewing.

Four errors are common enough to address directly.

• Highlighting without first shadowing. Many beginners add highlights without darkening the recesses. Push shadows darker than the base coat before adding highlights; the contrast range opens significantly.
• Using pure white for highlights. White desaturates colour rather than adding luminance, leaving chalky, artificial results. Use a warm, light tone appropriate to the colour: salmon-pink for red, pale warm blue-grey for blue, yellow-green for green. White belongs only at the apex of NMM specular highlights.
• Skipping mid-tones. Jumping from dark shadow to bright highlight creates a poster-colour look. A three-value approach (shadow, base, highlight) is the minimum; five values creates convincingly smooth volume.
• Losing definition between adjacent colour areas. Different materials should be shaded to different depths: armour shadows darker and more dramatic, cloth shadows softer and more gradual.

Object Source Lighting simulates the glow of a light source (a plasma weapon, a magical crystal, a torch) casting visible illumination onto the surrounding miniature surfaces.

The fundamental contrast principle in OSL is sometimes called "light inside shadow." The most impactful OSL creates a bright, intensely saturated focal point of warm light within a broadly shadowed, cool surrounding area. The temperature contrast between the warm glow and the cool shadows amplifies both: the light looks brighter because the surroundings are darker, and the shadows look deeper because the light source is more vivid.

A critical technique in OSL is preserving the underlying volume of the model. A common mistake is painting the OSL glow as a flat, opaque warm colour that wipes out the existing shading. Instead, the glow should be applied as a thin, transparent glaze that tints the existing highlights and mid-tones without replacing them. The underlying folds, armour edges, and surface variation should still be visible beneath the glow tint.

One notable exception: if the light source itself is in a recess (magical energy emanating from a crack, glowing inscriptions in carved grooves), the normal rules invert. The deepest recess becomes the brightest point, and the raised surfaces facing away from it fade toward shadow. This produces a visually striking effect that immediately communicates "light coming from inside."

Non-metallic metal is the advanced technique of painting the visual appearance of metal using only regular, non-metallic paints. It requires sophisticated understanding and application of contrast because the metallic illusion depends entirely on extreme value contrast in the right pattern.

Before attempting NMM, a painter should be comfortable with diluting paints, achieving smooth blends (through layering or glazing), and understanding basic light and shadow placement. NMM without these foundations produces results that look flat and unconvincing regardless of the colours chosen.

Study real metal. Hold a piece of shiny metal and observe exactly where the reflections appear, where the darkest darks sit, and how sharp the transitions between them are. Metallic surfaces have extremely abrupt transitions between specular highlights and deep shadows, much more abrupt than cloth or skin. This is the key observation.

Push extreme contrast. The specular highlight on NMM should be very close to pure white. The deep shadow should be very close to pure black. The range is far more extreme than any other surface material on a miniature. Beginners typically understate both ends of the range, producing NMM that reads as grey plastic rather than shiny metal.

Map first, blend later. Before smoothing any transitions, sketch out exactly where the extreme lights and extreme darks will sit using rough paint placements. Verify the placement looks correct before investing time in blending. Incorrect placement, even if beautifully blended, will not read as metal. Correct placement with rough blending still reads as metal.

Practice on geometric forms. Large, simple armour plates, cylinder shapes (sword hilts, gun barrels), and simple flat panels are the best surfaces for first NMM attempts. Complex freeform shapes require simultaneously managing multiple light sources and multiple reflection patterns, which is very difficult without foundational experience on simple geometry.

Contrast is the difference between a miniature that reads and one that does not. Value contrast does the heavy lifting; hue and saturation contrast support and refine it. The squint test diagnoses problems before they become permanent. Dark lining solves the most common readability issue at minimal technical cost.

Advanced contrast techniques (OSL and NMM) both require a solid foundation in basic value contrast to function. The principles are the same: strong darks, strong lights, clear separation between elements, and consistent logic in where light falls.

Improving contrast is the single change that produces the most visible quality jump in miniature painting at beginner and intermediate levels, because it is the foundational quality that every other technique depends on to be legible.