Pebeos Vitrail Lightening Medium is used to create lighter tones without reducing the quality of the paint nor making it more fluid. It is a lightning  mediums formulated to alter the characteristics of glass paint, specifically Pebeo Vitrail paints.

Lightning Medium - 45 ml.
Solvent Based, transparent, glossy, Lightening Medium.
Create lighter tones without reducing the quality of the Vitrail paint nor making it more fluid.