Use these fabulous mediums to manipulate the properties of Pebeo Vitrail colors and create wild designs on glass and metal.Mix the lightening medium with Vitrail paints to lighten the colors without thinning the paint's consistency or reducing the quali ty of the color. The matte medium will give your Vitrail colors a matte finish with a frosted effect. Apply the glitter medium alone or mixed with Vitrail colors to add sparkle to any project.