Winsor & Newton Artists’ Acrylic Slow Drying Medium slows the drying time of acrylic colours, giving you more time to work and blend your colours, without affecting the finished colour. Winsor & Newton’s range of Artists’ Acrylic mediums are high-quality formulations designed to complement the Artists’ Acrylic colours range. They bring control and working characteristics without colour shift or loss of depth. Combined in a proportion of 1:1, Winsor & Newton Artists’ Acrylic Slow Drying Medium will double drying time.