Mattmedium

Mattmedium is a term used to refer to matte medium, a clear, water-based acrylic polymer emulsion added to or applied over acrylic paints to create a flat, non-gloss finish. It is used by artists to alter surface texture, reduce shine, and control how light interacts with a painting. Matte medium can also extend paint, increase flow, and help unify the surface when working with multiple layers or mixed media.

In practice, matte medium is mixed with acrylic color or applied as a glaze, wash, or adhesive layer. When mixed into paint, it lowers gloss and can produce a more even, satin to flat appearance depending on the amount used. It is also used for collage or transfer techniques to reduce the visibility of underlying textures and to help bonds form between disparate materials. Matte medium dries clear and typically remains flexible, contributing to the durability of the film without significantly yellowing over time.

Differences from varnish are notable: matte medium is generally incorporated into or laid down during the painting process, whereas varnishes are typically applied as a final protective layer after completion. Matte medium is one of several acrylic additives offered by art-supply brands, alongside gloss mediums and gel mediums, allowing artists to tailor sheen, texture, and working properties.

Safety and storage are typical of water-based acrylic products: store sealed, away from extreme heat, and use in well-ventilated areas.