PrimoChill Intensifier Transparent Fluid Dye - UV Electric Blue Concentrate Yield: 15ml bottle dyes upwards of 1 US Gallon of coolant Formulated to provide the most Intense and vivid colors possible with "intense" quality inspection. Stongest, Most Powerful Industrial Dyes but still clean and pure with no special additives. Environmentally responsible safe and non toxic product. Safe on all plastics, rubbers,and miscellaneous gasket materials. Each Bottle is labled with a batch date to insure freshness. 2 year shelf life (unopened in original Black Out Bottle)