Matisse Acrylic Medium MM31 Open Medium

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SKU: 1MM2M31

Sale price$17.03 Regular price$24.32

Pickup available at Unit 11 / 12 Cecil Road, Hornsby

Usually ready in 24 hours

For multiple variant order, kindly use the "Bulk Order" sheet below.


Extends the "open" or "working" time of acrylics without affecting consistency. Allows a more relaxed approach desirable for blending, shading, and softening. (Size: 10L, 250ml, 1L)

Formulated to be mixed with either Matisse Structure or Matiss Flow acrylic colours to assist in prolonging drying time while maintaining the consistency of the paint. When mixed with Matisse Structure, they will retain their impasto quality, while Matisse Flow Acrylics will keep their smooth flowing feel with added body but not viscosity.

Optimal for painting outdoors or in particularly hot weather, MM31 Open Medium allows the paint to be blended on the painting surface for longer. Artists will be delighted with the way this medium makes their paint handle, so smooth and buttery. Be surprised by the glowing satin finish that this medium imparts to the paints.

Mixing Ratios

As little as 10% MM31 Open Medium to the paint, will lengthen the working time, allowing satisfying, smooth blends. By choosing to use smaller amounts of medium, the blending time is increased, but drying time is not drastically increased. However, a larger amount of Open Medium will dramatically increase the working time of the paint. The maximum retardation of drying time is reached with an equal mixture of paint to medium. Beyond this point, any further additions of MM31 Open Medium will result in minimal increases of drying time but may reduce waterfastness of the dried paint. However larger proportions (more medium than paint) will give transparency and will aid effective layering. 

As well as allowing more time to blend on the surface, paint mixed with MM31 Open Medium will stay fresh on the palette for several hours, depending both on the weather conditions and the quantity of MM31 Open Medium used. Easy to use, MM31 Open Medium will allow the reworking of areas of a painting in a way not previously possible.

The gel-like consistency of MM31 Open Medium allows it to remain in place on the palette, therefore it is suitable to be brush-mixed while painting, as well as to be pre-mixed on the palette.

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Customer Reviews

Based on 1 review
cara letho

Really fabulous medium for keeping paints open without losing pigment. I now use this with all my painting and printing. I've tried others but have found this is the best with no stickiness or clumping and goes well with all my different brands of acrylics.

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