Amsterdam Acrylic Medium Gel Matte 250 ml Amsterdam Acrylic Gel Mediums are the ideal choice for artists, students, and crafters interested in adding volume and dimension to their artwork and projects. These quality, versatile mediums work well with any brand of acrylic color, with a wide array of additives, and on virtually any surface. This matte medium allows color to be extended or made more transparent without affecting viscosity and reduces the degree of gloss. It can also be used for gluing all kinds of materials. Amsterdam Acrylic Gel Mediums are non-hazardous and clean up easily with water. They come in 250 ml, hangable plastic tubes with convenient, easy open lids.