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Watercolour Mediums

Discover a whole new world of Watercolour Mediums with ArtStore Online. At ArtStore Online, whether you are an avid painter, illustrator or a complete beginner, we will strive to help you with whatever you're after! We strive to bring you the best Watercolour Medium brands available, and have a wide range of art & craft supplies from trusted and respected brands from around the world, including Art Spectrum, Chroma, Derivan, Gamblin, Matisse, Winsor & Newton and more!    

Winsor & Newton Watercolour Art Masking Fluid 75ml

Original price $28.00 - Original price $28.00
Original price $28.00
$28.00
$28.00 - $28.00
Current price $28.00

Winsor & Newton Watercolour Art Masking Fluid is a liquid with added pigmentation for masking areas of work needing protection when colour is a...

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Original price $28.00 - Original price $28.00
Original price $28.00
$28.00
$28.00 - $28.00
Current price $28.00

Art Spectrum Masking Fluid

Original price $28.45 - Original price $79.85
Original price $28.45
$28.45 - $79.85
$28.45 - $79.85
Current price $28.45

Art Spectrum® Masking Fluid is a pigmented rubber latex-based liquid used for masking out areas. The coloured tint allows the artist to see the are...

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Original price $28.45 - Original price $79.85
Original price $28.45
$28.45 - $79.85
$28.45 - $79.85
Current price $28.45

NAM Masking Fluid

Original price $17.45 - Original price $48.40
Original price $17.45
$17.45 - $48.40
$17.45 - $48.40
Current price $17.45

Economical way to purchase masking fluid. Mask against watercolour, airbrush etc. Once dried must be removed within 6 hours. Use water to dilute €“...

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Original price $17.45 - Original price $48.40
Original price $17.45
$17.45 - $48.40
$17.45 - $48.40
Current price $17.45

Winsor & Newton Watercolour Colourless Masking Fluid 75ml

Original price $28.00 - Original price $28.00
Original price $28.00
$28.00
$28.00 - $28.00
Current price $28.00

A colourless liquid for masking areas of work needing protection when colour is applied in broad washes. Specifically designed for soft sized paper...

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Original price $28.00 - Original price $28.00
Original price $28.00
$28.00
$28.00 - $28.00
Current price $28.00

Art Spectrum Gum Arabic

Original price $19.95 - Original price $67.95
Original price $19.95
$19.95 - $67.95
$19.95 - $67.95
Current price $19.95

Art Spectrum® Gum Arabic increases the brilliance, gloss and transparency of watercolour and gouache paints, helping give extra depth to your colou...

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Original price $19.95 - Original price $67.95
Original price $19.95
$19.95 - $67.95
$19.95 - $67.95
Current price $19.95

Winsor & Newton Watercolour Granulation Medium 75ml

Original price $29.25 - Original price $29.25
Original price $29.25
$29.25
$29.25 - $29.25
Current price $29.25

Granulation Medium gives a mottled or granular appearance to colours which usually give a smooth wash, such as Winsor Red or Winsor Blue. By adding...

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Original price $29.25 - Original price $29.25
Original price $29.25
$29.25
$29.25 - $29.25
Current price $29.25

Art Spectrum Liquid Spectrum Extender Medium

Original price $13.55 - Original price $39.90
Original price $13.55
$13.55 - $39.90
$13.55 - $39.90
Current price $13.55

Restores adhesion and water-resistance in heavily diluted washes. May also be added to gouache or watercolour washes to provide a level of water r...

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Original price $13.55 - Original price $39.90
Original price $13.55
$13.55 - $39.90
$13.55 - $39.90
Current price $13.55

Winsor & Newton Gum Arabic 75ml

Original price $26.00 - Original price $26.00
Original price $26.00
$26.00
$26.00 - $26.00
Current price $26.00

A pale coloured solution that increases the gloss and transparency of water colour. It can be thinned with water.

Original price $26.00 - Original price $26.00
Original price $26.00
$26.00
$26.00 - $26.00
Current price $26.00

Winsor & Newton Watercolour Lifting Preparation 75ml

Original price $29.25 - Original price $29.25
Original price $29.25
$29.25
$29.25 - $29.25
Current price $29.25

Lifting Preparation allows dry washes, including staining colours, to be more easily lifted from paper with a wet brush or sponge. It is an ideal p...

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Original price $29.25 - Original price $29.25
Original price $29.25
$29.25
$29.25 - $29.25
Current price $29.25

Winsor & Newton Watercolour Iridescent Medium 75ml

Original price $29.25 - Original price $29.25
Original price $29.25
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$29.25 - $29.25
Current price $29.25

This medium gives pearlescent or glitter effects to your water colours. It can be mixed directly with water colours or applied over a dried wash.

Original price $29.25 - Original price $29.25
Original price $29.25
$29.25
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Current price $29.25

Molotow Grafx Masking Liquid Pens

Original price $20.95 - Original price $23.75
Original price $20.95
$20.95 - $23.75
$20.95 - $23.75
Current price $20.95

Molotow Grafx Masking Liquid Pens allow you to apply masking liquid easily without needing a brush. Molotow Grafx Masking Liquid is water-based col...

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Original price $20.95 - Original price $23.75
Original price $20.95
$20.95 - $23.75
$20.95 - $23.75
Current price $20.95

Winsor & Newton Ox Gall 75ml

Original price $41.00 - Original price $41.00
Original price $41.00
$41.00
$41.00 - $41.00
Current price $41.00

A wetting agent used to improve flow when mixed directly with water colours. It can also be used on very hard sized papers to reduce surface tension.

Original price $41.00 - Original price $41.00
Original price $41.00
$41.00
$41.00 - $41.00
Current price $41.00

Art Spectrum Talc 500gm

Original price $10.50 - Original price $10.50
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$10.50
$10.50 - $10.50
Current price $10.50

Talc is used for many applications in woodworking. From making gesso to be used as a decorative finish or as a grain filler, etc. to use as a lubri...

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Original price $10.50 - Original price $10.50
Original price
$10.50
$10.50 - $10.50
Current price $10.50

Holbein Masking Pen 25ml

Original price $29.35 - Original price $29.35
Original price $29.35
$29.35
$29.35 - $29.35
Current price $29.35

Discover the creative potential of Holbein Masking Pen. The perfect artist's tool for blocking out—or reserving areas of artwork, this pen allows y...

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Original price $29.35 - Original price $29.35
Original price $29.35
$29.35
$29.35 - $29.35
Current price $29.35

Winsor & Newton Watercolour Permanent Masking Medium 75ml

Original price $29.25 - Original price $29.25
Original price $29.25
$29.25
$29.25 - $29.25
Current price $29.25

This medium is used to mask specific areas of paper, making them resistant to water. It can also be mixed with water colours and is ideal for isola...

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Original price $29.25 - Original price $29.25
Original price $29.25
$29.25
$29.25 - $29.25
Current price $29.25

Winsor & Newton Watercolour Texture Medium 75 ml

Original price $29.25 - Original price $29.25
Original price $29.25
$29.25
$29.25 - $29.25
Current price $29.25

Texture medium contains fine particles and can be used to give the impression of depth and structure to water colour paintings. It is ideal for emp...

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Original price $29.25 - Original price $29.25
Original price $29.25
$29.25
$29.25 - $29.25
Current price $29.25

Winsor & Newton Watercolour Blending Medium 75ml

Original price $29.25 - Original price $29.25
Original price $29.25
$29.25
$29.25 - $29.25
Current price $29.25

This liquid is used to slow the drying rate of water colours allowing more time for blending. It is particularly useful in hot climates where artis...

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Original price $29.25 - Original price $29.25
Original price $29.25
$29.25
$29.25 - $29.25
Current price $29.25

Winsor & Newton Watercolour Aquapasto 60ml

Original price $50.25 - Original price $50.25
Original price $50.25
$50.25
$50.25 - $50.25
Current price $50.25

Aquapasto is a transparent gel medium that reduces flow and gives a bodied effect to water colour and gouache.

Original price $50.25 - Original price $50.25
Original price $50.25
$50.25
$50.25 - $50.25
Current price $50.25

If you are looking to improve the flow of your paint, experiment with new techniques or achieve professional results in your watercolour paintings, you have come to the right place. Our carefully selected range of watercolour mediums helps artists create beautiful artwork with confidence.

What Are Watercolour Mediums?

Watercolour mediums are specially formulated products that change how your paint behaves without replacing it. By adding a small amount of liquid medium to your mixing water or directly to your colour, you can enhance the way your paints perform on paper. Doing this helps you to achieve a wider range of creative effects.

Some mediums enhance flow by reducing surface tension, which allows colour to spread more evenly across wet paper. Others increase transparency. Extend drying time. Or produce interesting textural effects that would be difficult to achieve with painting water alone.

Which Watercolour Medium Should You Choose?

The right medium for your needs really depends on the style of painting you enjoy and the effect you want to achieve. For instance, if you prefer smooth, even washes, an ox gall medium or synthetic ox gall can improve your paint's wetting properties. Usually, a few drops are all that is needed to encourage increased flow and help the brush glide more easily across both cold-pressed and hot-pressed paper.

However, if you're interested in creating dramatic landscapes or expressive backgrounds, then a granulation medium is ideal because it encourages certain colours and pigments to separate naturally. This adds extra texture, depth and visual interest to your paintings.

For those who enjoy making soft transitions between colours, a watercolour blending medium slows the movement of moisture just enough to give you greater control as colours are mixed. This makes it easier to blend skies, water and other large areas where smooth colour changes are required.

Exploring Creative Techniques

Watercolour mediums are also useful when you want to try something different. Art Masking fluid protects selected areas of the surface while you paint around them. Once everything is completely dry, you can gently remove the masking fluid with an eraser or a cotton bud. This will reveal clean white highlights underneath.

Many artists also use gum arabic, which is a natural binder that increases the richness of colour. It adds a subtle gloss and improves transparency. Products, such as Daler Rowney's Art Mediums, include specialised solutions for painters who want to explore a wider range of watercolour techniques.

Some painters even combine watercolours with gouache, ink or pen work to create mixed-media artwork. Choosing the desired level of medium allows you to experiment with different forms. They include everything from delicate botanical drawing to bold contemporary illustrations.

Tips for Using Watercolour Mediums

Most watercolour mediums are highly concentrated. So, it is advisable to use them sparingly. Start with a few drops from the bottle and test the results before adding more. This should give you better control over the final appearance of your painting.

When introducing a new medium, always use a clean, wet brush and a fresh solution. Some products are colourless. However, others may slightly influence the behaviour of your paints. It is worth testing on scrap paper first to best understand how each medium performs.

At ArtStore Online, you'll find a carefully selected range of watercolour mediums that are suitable for both beginners and experienced painters. If you want better coverage with a fast-drying medium, improved flow, and subtle staining effects. Or to create new possibilities using gum, salt, alcohol or specialist mediums. We've got you covered.