Nine Materials That Expand What Watercolor Can Do
Introduction
Watercolor doesn't need begin and end with a brush. One of the most enjoyable aspects of developing a watercolor practice is discovering how other materials interact with the paint to create textures and effects that a brush alone cannot produce. Some of these materials are traditional art supplies used in unconventional ways. Others are tools you might already have at home.
This guide covers nine materials that are part of my regular painting practice, with practical explanations of how each one works and what effects it produces. The examples and observations come from my direct experience with these materials rather than from theoretical descriptions.
A brief note before we begin: salt, plastic wrap, and sponge are popular watercolor texture techniques with a lot of excellent content available online. They produce genuinely interesting results and are worth exploring if they appeal to you.
This guide focuses on a different set of materials, because the nine covered here are what actually I get used in practice. A short section at the end describes how salt, plastic wrap, and sponge work for readers who want to explore those approaches.
1. Wax Crayon or White Wax Pencil: Resistance and Texture
A wax crayon applied to watercolor paper before painting creates a barrier that watercolor paint cannot penetrate. The wax repels water, so when paint is applied over a waxed area, it slides around the wax rather than absorbing into the paper. The result is a visible texture where the paper color shows through the paint in the pattern of the wax marks.
The technique works with any wax crayon, including basic school crayons, but a white wax pencil or white wax stake gives the most control. With a colored crayon, the color of the wax itself becomes part of the result. With a white wax pencil, the resistance is invisible until paint is applied, which makes it easier to plan precisely where the texture will appear.
Practical applications include creating areas of light that are protected from paint from the very beginning, adding a crackled texture to backgrounds or stone surfaces, isolating specific areas of the paper before applying a wash, and suggesting the texture of rough surfaces like bark or fabric.
The wax effect is permanent once applied. You cannot remove it, so plan where you want the resistance before the first wash rather than adding it later.
2. Spray Bottle: Atmospheric Effects and Soft Textures
A spray bottle filled with clean water is a versatile tool for creating atmospheric effects, softening edges, and producing textures that a brush cannot replicate with the same organic quality.
The most controlled use is misting lightly over a painted area to soften hard edges or blend colors that have been applied too separately. A fine mist of water diffuses the boundary between two areas without fully re-wetting the surface, which creates a softer transition than going back in with a wet brush.
For looser, more expressive effects, spraying over a wet painted area causes the colors to spread outward in patterns determined by the water droplets and the angle of the spray. This creates soft, atmospheric passages that work well for backgrounds, skies, and areas that should feel diffuse rather than defined.
One of the most useful texture applications is the speckled effect created by spraying over paint that is almost but not quite dry. When water droplets hit paint at this stage of drying, they push the pigment outward in small rings, creating a texture similar to what salt produces but with more control over the scale and distribution of the marks. Using a hairdryer immediately after spraying helps fix the effect before it continues to spread.
The spray bottle is also practical for applying background washes more quickly than a loaded brush, and for keeping the palette moist during longer painting sessions.
3. Dry Marker: Stippling and Gradient Effects
A marker that has run out of its original ink, cleaned thoroughly to remove all residue, can be loaded with watercolor paint and used as an alternative to a brush. The result is a different kind of mark than any brush produces, and the technique has specific qualities that make it useful for particular effects.
To prepare a dry marker, remove the ink refill, clean the interior and the tip completely with water, and allow it to dry. The tip should have no color left in it before you use it with watercolor. Load the clean tip by pressing it directly into a well of paint on the palette, then apply it to the paper in whatever pattern you need.
The most appealing quality of this technique is what happens as the paint supply in the tip depletes. Because the tip holds only a small amount of paint, each stroke gradually lightens as the paint runs out, creating a natural gradient within the mark without any deliberate effort. This makes the dry marker particularly effective for stippling work, where the variation in tone adds depth and texture automatically.
The technique also produces very consistent dot shapes, which are difficult to achieve with a brush tip. For pointillist approaches, pattern work, or areas where you want a precise circular mark of any size, a dry marker loaded with paint gives you consistent control that a pointed brush cannot match.
Cleaning between colors requires pressing the tip onto a damp paper towel and repeating until no color transfers, then pressing onto a dry section to confirm the tip is clean before loading a new color.
4. White Paint: Details, Highlights and Corrections
White opaque paint is one of the most useful finishing tools in watercolor, even though it is technically a departure from pure transparent watercolor technique. Most watercolor painters use some form of white paint at some point, and understanding which type to use for which purpose makes a significant practical difference.
The main options fall into four categories.
White gouache is the most traditional choice among watercolor painters. It is opaque, matte, and integrates reasonably well with the surface texture of watercolor paper.
It works well for corrections of medium-sized areas and for highlights that need coverage rather than just a fine line. Its limitation is that it can reactivate slightly when water touches it later in the painting process.
Fabric paint in white has good opacity, is less plastic in texture than acrylic paint, dries to a matte finish, and is significantly more affordable than professional gouache for regular use.
It also stays workable slightly longer than acrylic, which can be reactivated on the following day if kept in a sealed container. For splatters, general highlights, and corrections, it is a practical and economical option.
A white Posca pen is ideal for fine details and controlled application. The pen format gives you consistent line width depending on the tip size you choose, which makes it useful for drawing specific highlight lines, veins on leaves, fine details on flower centers, and any mark where precision matters more than coverage area. The opacity is excellent.
A white gel pen produces the finest lines of any of these options and works well for delicate patterns, reflections, thin light lines, and any detail where the mark needs to be as thin as possible. Quality varies considerably between brands, so testing before relying on it for finished work is worthwhile.
For a complete guide to all the options for creating white effects in watercolor and when each one works best, this How to Use White in Watercolor article covers all eight approaches in detail.
5. Ink Pen: Defined Lines and Contrast
An ink pen, typically a fineliner or technical pen with waterproof ink, adds a quality to watercolor work that paint alone rarely achieves: precise, consistent line weight. The combination of fluid watercolor washes and sharp ink lines creates a visual contrast that makes both elements stronger.
The pen can be used before or after the watercolor, and the choice between these two approaches produces different results.
Using ink before watercolor means the lines guide the painting. You draw the structure of the composition in ink first, then add color with watercolor washes.
This approach is particularly effective for botanical illustration, architectural subjects, and any composition where defined outlines are part of the visual language. The ink holds the structure while the watercolor provides atmosphere, color, and depth.
Using ink after watercolor means the lines add detail and texture to a painting that already has its color established. This approach works well for adding fine detail to surfaces, suggesting texture through hatching or cross-hatching, reinforcing outlines that have softened during the painting process, and adding elements like stems, veins, or fine marks that would be difficult to paint with a brush.
The critical practical consideration is waterproofness. Before using any ink pen in combination with watercolor, test whether the ink is water-resistant by applying a line to scrap paper, allowing it to dry completely, and then brushing water over it. If the ink runs or bleeds, it cannot be used under watercolor. If it holds cleanly, it can be used before or after without risk.
6. Posca Pen: Opacity and Vibrant Color
The Posca pen is a water-based paint marker with high opacity and strong adhesion to most surfaces including watercolor paper. Where the white gel pen or white gouache is used for highlights and corrections, the Posca pen adds something different: the ability to apply opaque color over dried watercolor in any hue, not just white.
The most frequent use is white, for the same highlights and details described in section 4. But the pen comes in a wide range of colors, and using a colored Posca over a dried watercolor wash produces a distinctive layered effect where the opaque mark sits visually in front of the transparent layers beneath it. Blues, yellows, and pinks over dark watercolor backgrounds create a sense of luminosity that is difficult to achieve with transparent paint alone.
The pen format also allows for very controlled splattering. Loading the tip and then tapping the pen against a finger or brush handle produces fine paint droplets that scatter across the surface in a random pattern. This is a useful technique for suggesting texture, adding stars to a dark sky, or creating a soft scattered highlight effect on water.
The Posca is one of the materials that makes the transition from pure watercolor toward mixed media feel natural rather than abrupt. It adds capabilities without requiring a fundamentally different approach to the work.
7. Colored Pencils: Fine Texture and Detail
Colored pencils applied over completely dried watercolor add a layer of texture and detail that is difficult to achieve with any brush. The pencil tip can follow very precise paths, respond to the texture of the paper surface, and build up tone gradually through layering in a way that complements rather than competes with the watercolor underneath.
The most common application is adding texture to surfaces that should look tactile rather than smooth. Wood grain, fabric weave, the rough texture of stone, the fine parallel lines that suggest a woven or knitted surface: all of these are more easily suggested with a colored pencil than with a brush. The pencil allows you to draw individual lines within a painted area without the risk of reactivating the paint beneath.
For botanical and floral subjects, colored pencils are particularly useful for adding the fine linear details that give plants their distinctive character: the central vein of a leaf and its branching pattern, the radial lines of a flower center, the subtle striping along a petal. These marks are technically possible with a very fine brush, but a pencil gives more control with less risk.
White colored pencil over dried watercolor creates a soft, slightly luminous highlight effect that is subtler than opaque white paint. It is useful in areas where you want to suggest light without the stark contrast of a Posca pen or gouache mark.
Colored pencils over watercolor is also one of the most natural bridges into mixed media work. Once you are comfortable with the combination, the same approach extends to watercolor pencils, pastel pencils, and other pencil-format media that integrate with water-based paint.
8. Dry Pastel: Softness and Atmospheric Depth
Dry pastel applied over completely dried watercolor adds a quality that no other material in this list produces: a soft, velvety atmospheric effect that can transform the mood of a painting. Where watercolor creates depth through transparency, pastel creates softness through opacity and texture.
The technique requires that the watercolor beneath is fully dry before any pastel is applied. Applying pastel over even slightly damp paint causes it to smear into the wet surface rather than sitting on top of it. Once the watercolor is dry, the texture of the paper provides enough tooth for the pastel to adhere.
Apply the pastel by touching the stick lightly to the paper surface and then blending outward with a cotton swab, a blending stump, or a small piece of soft fabric. Avoid using a finger directly because the oils in skin can create uneven patches and may interfere with the pastel adhering properly.
The most effective applications are atmospheric: a soft glow around a moon or light source, the hazy quality of fog or mist in a landscape, the subtle tonal shift at the edge of a shadow that makes it feel diffused rather than hard, and the luminous shimmer at a horizon where sky meets water.
For all of these effects, the pastel's ability to sit softly on the surface rather than being absorbed into the paper creates a visual layer that transparent watercolor cannot replicate.
Dry pastel requires a fixative spray to protect the work after application. Apply the fixative in light, even passes at the distance specified on the can, allowing each pass to dry before adding another. Without fixative, the pastel will smear with any contact.
9. Gouache: Opacity and Mixed Media Effects
Gouache is an opaque water-based paint that occupies a middle position between watercolor and acrylic. Like watercolor, it is water-soluble and can be thinned to a fluid consistency. Like acrylic, it can cover underlying paint with opaque marks. This combination makes it a highly versatile companion to watercolor.
The most dramatic application is painting opaque elements over a dark watercolor background. A deep, atmospheric watercolor wash in indigo, dark blue, or earth tones becomes a foundation, and gouache in lighter colors is applied on top to paint the subjects that appear against that background: flowers, botanical forms, decorative patterns, architectural elements.
The result has a completely different visual logic from standard watercolor, where light areas are preserved from the start. With gouache over dark watercolor, you build from dark to light, which opens up entirely different compositional possibilities.
When gouache is diluted significantly, it behaves more like a thick watercolor wash with slightly reduced transparency. At this consistency, it is useful for creating atmospheric veils of soft color, misty effects, and subtle corrections to areas that need a gentle shift in tone without full coverage.
Mixing a small amount of gouache into watercolor produces a semi-opaque paint that sits between the two materials in its visual behavior. This intermediate consistency is useful for specific mid-ground effects where you want more body than watercolor but less coverage than full gouache.
One practical consideration: once gouache dries, it can reactivate with water. If you plan to add watercolor layers over a dried gouache element, work carefully to avoid dissolving the gouache marks. Some artists seal gouache areas with a light spray fixative before continuing with watercolor on top.
The combination of watercolor and gouache is one of the most natural entry points into mixed media work. The two materials share the same water-based chemistry, use the same brushes and tools, and integrate visually in a way that feels coherent rather than like two separate paintings layered over each other.
A Note on Salt, Plastic Wrap and Sponge
These three techniques are among the most widely discussed watercolor texture methods, and for good reason: they produce distinctive and visually interesting results.
Salt applied to wet watercolor absorbs moisture from the paint as it dries, pushing the pigment outward and creating a granulated, crystalline texture. The scale and density of the pattern depend on the grain size of the salt and how wet the paint is when the salt is applied. The texture is most visible in dark, heavily pigmented washes. After the paint dries completely, the salt is brushed away, leaving the pattern in the paint.
Plastic wrap pressed into wet watercolor and left in place until the paint dries creates an organic, crumpled pattern as the plastic folds and channels the pigment. The result resembles natural textures like rock surfaces, leaf patterns, or ice. The specific texture depends on how the plastic is applied and how tightly it contacts the surface.
A sponge loaded with paint and pressed onto paper creates an irregular dotted texture that is useful for foliage, rough surfaces, and any area where a mottled, non-uniform mark is needed. Different sponge textures produce different patterns.
All three techniques are easy to find in dedicated tutorials with visual demonstrations. They work reliably and produce repeatable results once you understand the timing.
The reason they are not the focus of this guide is simply that they are not part of the regular practice that informs it. The nine materials covered in detail above are what actually get used, and the observations about them come from direct experience rather than description.
Conclusion
Expanding your material range in watercolor does not require a large investment or a completely new approach to painting. Most of the materials in this guide are tools you may already have or can find easily, and each one adds a specific capability that paint and brush alone cannot provide.
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| Mixed Media Art: Watercolor, Pastel, Colored Pencil, Gouache, Posca |
The most productive way to explore these materials is one at a time. Choose one, use it deliberately in several paintings, and observe how it behaves with your specific paints and paper. Over time you develop an instinct for when each material is useful and when it is not, which is more valuable than knowing all of them theoretically.
Several of these materials, particularly ink pens, gouache, colored pencils, and dry pastel, also open the door to mixed media work, where watercolor serves as a foundation and other materials contribute their specific qualities on top. That is a natural next step for watercolor painters who want to expand their expressive range beyond what transparent paint alone can do.
For more on the core watercolor techniques that form the foundation before these materials come into play, this Watercolor Techniques for Beginners guide covers wet-on-wet, wet-on-dry and dry brush with step-by-step instructions.
And for guidance on using dark tones and contrast to make any of these texture techniques more effective, this How to Make Watercolor More Vibrant article covers the principles that make paintings feel alive rather than flat.
Happy painting.
