Professional grade mediums from Holbein.

Iridescent Medium is an artist-grade medium designed to facilitate iridescent (pearlescent) effects when used with water based media including watercolor, acrylic, gouache and acrylic gouache. It can be used dry and is particularly effective when applied as an initial layer.  Available in 60ml Squeeze bottle.

Multi-Sizing Liquid is an artist grade sizing liquid which is used to reduce the absorbency of paper. Dilute it with warm water and apply it with a broad brush. Available in 60ml squeeze bottle.

Ox Gall Medium is an artist-grade wetting agent that improves flow and enhances wet-into-wet techniques when mixed with watercolors. It also improves the acceptance of watercolor on paper, particularly hard-sized papers. Available in 60ml squeeze bottle.

Watercolor Medium When mixed with watercolors, Holbein Watercolor Medium facilitates fine line and stroke development by improving flow. Available in 60ml squeeze bottle.